3(x+4)-4(x-2)=3x steps please
2006-10-26 13:40:49 · 15 個解答 · 發問者 Manet 1 in 科學 ➔ 數學
3(x+4)-4(x-2)=3x
3x + 12 - 4x + 8 = 3x
3x-4x+12+8=3x
-x+20=3x
-x+20+x=3x+x
20 =4x
4x=20
4x/4=20/5
x = 5
2006-10-27 19:16:19 · answer #1 · answered by 軒 3 · 0⤊ 0⤋
-------3(x+4)-4(x-2)=3x
---------3x+12-4x+8=3x
------------------12+8=3x-3x+4x
----------------------4x=20
------------------------x=5
2006-10-26 14:06:08 · answer #2 · answered by ? 1 · 0⤊ 0⤋
3(x+4)-4(x-2)=3x
3x+12-4x+8=3x
-x+20=3x
20=3x+x
20=4x
x=5
2006-10-26 13:45:54 · answer #3 · answered by awidjow 1 · 0⤊ 0⤋
3 (x+ 4) - 4 (x - 2) = 3x
3x + 12 - 4x + 8 = 3x
-x + 20 = 3x
-4x = -20
x = 5
2006-10-26 13:45:46 · answer #4 · answered by ji hin 1 · 0⤊ 0⤋
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2006-10-26 13:44:07 · answer #5 · answered by MiMi 7 · 0⤊ 0⤋
3x + 12 -4x +4 = 3x
12 + 4 = 3x - 3x + 4x
16 = 4x
4 = x
x=4
2006-10-26 17:45:46 補充：
3x + 12 -4x +8= 3x12 + 8 = 3x - 3x + 4x20= 4x5 = xx=5
2006-10-26 13:44:05 · answer #6 · answered by Adit 3 · 0⤊ 0⤋
3( x + 4 ) - 4( x - 2) = 3x
3X + 12 - 4X + 8 = 3X
-4X = -20
X = 5
2006-10-26 13:44:03 · answer #7 · answered by chris 2 · 0⤊ 0⤋
3(x+4)-4(x-2)=3x
3x + 12 - 4x + 8 = 3x
4x = 20
x = 5
2006-10-26 13:43:50 · answer #8 · answered by andy 2 · 0⤊ 0⤋
3x+12-4x+8=3x
12+8=3x-3x+4x
20=4x
x=5
2006-10-26 13:43:17 · answer #9 · answered by Ceci 3 · 0⤊ 0⤋
3(x+4)-4(x-2)=3x
3x+12-4x+8=3x
-4x=-20
x=5
2006-10-26 13:43:07 · answer #10 · answered by Danny 2 · 0⤊ 0⤋