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3x=12
x=4
2. 4x+8-1=3x+4
4x-3x=4+1-8
x=-3
2x+x-3 = 9
3x-3 = 9
3x = 9+3
3x = 12
x = 12/3
x = 4
2. 4(x+2)-1 = 3x+4
4x+8-1 = 3x+4
4x+7 = 3x+4
4x+7-4 = 3x
4x+3 = 3x
3 = 3x - 4x
3 = -x
x = -3