(4x+5+7)/2 = x |*2
4x+5+7 = 2x
4x-2x = -5-7
2x = -12 /:2
x= -6
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(4x+5+7)/2 = x |*2
4x+5+7 = 2x
4x-2x = -5-7
2x = -12 /:2
x= -6