algebra
2007-05-01 13:41:58 · 9 answers · asked by Mayra M 1 in Science & Mathematics ➔ Mathematics
18x-2=99-21+28x
18x-2=78+28x
+2
18x=80+28x
-28x
-10x=80
/-10
x=-8
2007-05-01 13:46:52 · answer #1 · answered by Cherriest 7 · 0⤊ 0⤋
2(9x-1)=99-7(3-4x)
Distribute
2*9x-2*1 = 99-7*3-7(-4x)
Simplify
18x-2 = 99-21+28x
Move all the x terms to the left, all others to the right
18x-28x = 99-21+2
Simplify
-10x = 80
Divide both sides by -10
x = -8
Check:
2(9*(-8)-1) = 2*(-73) = -146.
99-7*(3-4*(-8)) = 99-7(35) = 99-245 = -146
2007-05-01 20:55:11 · answer #2 · answered by NSurveyor 4 · 0⤊ 0⤋
2(9x-1)=99-7(3-4x)
Expand the equation
18x-2 = 99-21+28x
18x-2 = 78+28x
Add 2 to both sides and subtract 28x from both sides
-10x = 80
x = -8
.
2007-05-01 20:50:49 · answer #3 · answered by Robert L 7 · 0⤊ 0⤋
uff.. havent done this in years.. lets see..
18x - 2 = 99 - 21 + 28x
18x - 28x = 99 - 21 + 2
-10x = 80
x = -8
2007-05-01 20:52:43 · answer #4 · answered by dhaliman 1 · 0⤊ 0⤋
x = -8
18x - 2 = 99 - 21 + 28x
-10x = 80
x = -8
2007-05-01 20:44:23 · answer #5 · answered by Mike T 2 · 0⤊ 0⤋
2(9x-1)=99-7(3-4x)
18x-2=99-21+28x
18x-2=78+28x
-2=78+10x
-80=10x
x=-8
2007-05-01 20:46:36 · answer #6 · answered by Anonymous · 0⤊ 0⤋
2(9x-1)=99-7(3-4x)
18x-2=99-21+28x
18x-2=78+28x
18x-2-78-28x=0
-10x-80=0
-10x=80
x=-8
2007-05-01 21:38:30 · answer #7 · answered by bootis32 6 · 0⤊ 0⤋
18x-2=99-21+28x
18x-18x-2=99-21+26x-18x
-2=78+8x
-2-78=78-78+8x
-80=8x
-10=x
2007-05-01 20:50:00 · answer #8 · answered by Dave aka Spider Monkey 7 · 0⤊ 0⤋
2(9x-1)=99-7(3-4x)
18x-2=99-21+28x
18x-2=28x+78
-10x-2=78
-10x=80
x=-8
Check:
2(9(-8)-1)=99-7(3-4(-8))
2(-72-1)=99-7(3+32)
2(-73)=99-7(35)
2(-73)=99-245
-146=-146
2007-05-01 20:56:10 · answer #9 · answered by Anonymous · 0⤊ 0⤋