3x - 2 = 2x + 4
3x - 2x = 4 + 2
x = 6
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2x + 5 = 13 2x = 8 2x/2 = 8/2 x=4
2x + 7 + 2x = 23 4x + 7 = 23 4x = 16 x = 16/4 x = 4
x = 0 and y = 4
2x-4=6x+8-8= -82x-12= 6x-2x= -2x-12= 4x/4=/4-3=x
-2x + 2y = 4 is equivalent to twice -2 + y = 2 which is the equation of a straight line.