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x in (-oo:+oo)
(1/2)*x = (7/10)*x+3/5 // - (7/10)*x+3/5
(1/2)*x-((7/10)*x)-(3/5) = 0
(1/2)*x+(-7/10)*x-3/5 = 0
-1/5*x-3/5 = 0 // + 3/5
-1/5*x = 3/5 // : -1/5
x = 3/5/(-1/5)
x = -3
x = -3
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