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x in (-oo:+oo)
(-1/2)*x-((1/3)*x)+4 = 8 // - 8
(-1/2)*x-((1/3)*x)-8+4 = 0
(-1/2)*x+(-1/3)*x-8+4 = 0
-5/6*x-4 = 0 // + 4
-5/6*x = 4 // : -5/6
x = 4/(-5/6)
x = -24/5
x = -24/5
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