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a)12x - 10 = 5x + 11
b)14 - 3x = 2x + 29
c)10 - 4x = 9 - 2x
d)14x + 4 + 12x + 12 = 2
a)12x - 10 = 5x + 11
b)14 - 3x = 2x + 29
c)10 - 4x = 9 - 2x
d)14x + 4 + 12x + 12 = 2
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12x - 5x = 11 + 10
7x = 21
x = 3
b)14 - 3x = 2x + 29
-3x -2x = 29 - 14
-5x = 15
x = -3
c)10 - 4x = 9 - 2x
-4x +2x = 9 - 10
-2x = -1
x= 1/2
d)14x + 4 + 12x + 12 = 2
14x+12x = 2 - 4 - 12
26x = -14
x = -14/26
x=-7/13
7x = 21
x = 7/21
x = 3
b)-3x - 2x = 29 - 14
- 5x = 15
x = -5/15
x = -3
c) -4x + 2x = 9 - 10
-2 x = -1
x = 1/2
d) 14x + 12x = -4 -12 + 2
26 x = -16 +2
26 x = - 14
x = -14/26
obs; Não sei se a última está certa