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x in (-oo:+oo)
(1/4)*x-((1/2)*x) = 1/2-5 // - 1/2-5
(1/4)*x-((1/2)*x)-(1/2)+5 = 0
(1/4)*x+(-1/2)*x-1/2+5 = 0
9/2-1/4*x = 0 // - 9/2
-1/4*x = -9/2 // : -1/4
x = -9/2/(-1/4)
x = 18
x = 18
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