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x in (-oo:+oo)
(1/2)*x-(3/4) = (3/5)*x // - (3/5)*x
(1/2)*x-((3/5)*x)-(3/4) = 0
(1/2)*x+(-3/5)*x-3/4 = 0
-1/10*x-3/4 = 0 // + 3/4
-1/10*x = 3/4 // : -1/10
x = 3/4/(-1/10)
x = -15/2
x = -15/2
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