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x in (-oo:+oo)
(1/2)*x-((1/3)*x) = 2-4 // - 2-4
(1/2)*x-((1/3)*x)-2+4 = 0
(1/2)*x+(-1/3)*x-2+4 = 0
1/6*x+2 = 0 // - 2
1/6*x = -2 // : 1/6
x = -2/1/6
x = -12
x = -12
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