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x in (-oo:+oo)
(1/2)*x-7 = (3/2)*x-1 // - (3/2)*x-1
(1/2)*x-((3/2)*x)-7+1 = 0
(1/2)*x+(-3/2)*x-7+1 = 0
-x-6 = 0 // + 6
-x = 6 // * -1
x = -6
x = -6
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