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x in (-oo:+oo)
(1/2)*x-((1/3)*x) = -4 // + 4
(1/2)*x-((1/3)*x)+4 = 0
(1/2)*x+(-1/3)*x+4 = 0
1/6*x+4 = 0 // - 4
1/6*x = -4 // : 1/6
x = -4/1/6
x = -24
x = -24
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