Please solve it for x. Assume the / is a fraction bar.
2007-05-30 11:47:07 · 5 answers · asked by Paul 1 in Science & Mathematics ➔ Mathematics
Cross multiply
7(x+3) = 5(x+1)
7x + 21 = 5x + 5
2x = -16
x = -8
2007-05-30 11:49:50 · answer #1 · answered by Anonymous · 0⤊ 1⤋
Solve the "x" variable... 7/(x+1)=5/(x+3)
First: eliminate fractions - multiply the denominators or, greatest common denominator with each term which is,
(x+1)(x+3).
(x+1)(x+3)[7/(x+1)]=(x+1)(x+3)[5/(x+3)]
Sec: cross cancel "like" terms & combine the rest.
(x+3)[7]=(x+1)[5]
(7)(x)+(7)(3) = (5)(x)+(5)(1)
7x+21 = 5x+5
Third: combine "like" terms - subtract 21 from both sides (when you move a term to the opposite side, always use the opposite sign).
7x+21-21 = 5x+5-21
7x = 5x+5-21
7x = 5x-16
*Subtract "5x" from both sides.
7x-5x = 5x-5x-16
7x-5x = -16
2x = -16
*Divide both sides by 2.
2x/2 = -16/2
x = -16/2
x = -8
2007-05-30 18:57:46 · answer #2 · answered by ♪♥Annie♥♪ 6 · 0⤊ 0⤋
7x + 21 = 5 x + 5
2x = - 16
x = - 8
2007-05-31 05:09:39 · answer #3 · answered by Como 7 · 0⤊ 0⤋
/ is a fraction bar? That's a big assumption...
5x + 5 = 7x + 21
2x = -16
x = -8
2007-05-30 18:49:53 · answer #4 · answered by emp211 3 · 0⤊ 0⤋
7x+21=5x+5
2x=-16
x=-8
2007-05-30 18:50:25 · answer #5 · answered by Hang 3 · 0⤊ 0⤋