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6x= 6
x = 1
b) -3 + 2x - 6 = 3 - 4x
6x = 12
x = 2
c) 7x + 2 = 5 + 3x + 9
4x = 12
x =3
d) -5x + 12 + x = 2x - 12
-8x = 0
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