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x in (-oo:+oo)
(-1/2)*x+7 = (1/2)*x+6 // - (1/2)*x+6
(-1/2)*x-((1/2)*x)-6+7 = 0
(-1/2)*x+(-1/2)*x-6+7 = 0
1-x = 0 // - 1
-x = -1 // * -1
x = 1
x = 1
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