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x in (-oo:+oo)
x+7 = (1/2)*(4*x-2) // - (1/2)*(4*x-2)
x-((1/2)*(4*x-2))+7 = 0
(-1/2)*(4*x-2)+x+7 = 0
x-1/2*(4*x-2)+7 = 0
x-1/2*(4*x-2)+7 = 0
1-x+7 = 0
8-x = 0
8-x = 0
8-x = 0 // - 8
-x = -8 // * -1
x = 8
x = 8
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