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x in (-oo:+oo)
(1/2)*x = (3/2)*x-7 // - (3/2)*x-7
(1/2)*x-((3/2)*x)+7 = 0
(1/2)*x+(-3/2)*x+7 = 0
7-x = 0 // - 7
-x = -7 // * -1
x = 7
x = 7
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