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x in (-oo:+oo)
(1/2)*x-((1/3)*x) = -5 // + 5
(1/2)*x-((1/3)*x)+5 = 0
(1/2)*x+(-1/3)*x+5 = 0
1/6*x+5 = 0 // - 5
1/6*x = -5 // : 1/6
x = -5/1/6
x = -30
x = -30
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