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x in (-oo:+oo)
(1/2)*x-((3/4)*x) = 5 // - 5
(1/2)*x-((3/4)*x)-5 = 0
(1/2)*x+(-3/4)*x-5 = 0
-1/4*x-5 = 0 // + 5
-1/4*x = 5 // : -1/4
x = 5/(-1/4)
x = -20
x = -20
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