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x in (-oo:+oo)
(1/2)*x+7 = (1/3)*x+4 // - (1/3)*x+4
(1/2)*x-((1/3)*x)-4+7 = 0
(1/2)*x+(-1/3)*x-4+7 = 0
1/6*x+3 = 0 // - 3
1/6*x = -3 // : 1/6
x = -3/1/6
x = -18
x = -18
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