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x in (-oo:+oo)
(1/6)*x-(1/2) = -42 // + 42
(1/6)*x-(1/2)+42 = 0
(1/6)*x-1/2+42 = 0
1/6*x+83/2 = 0 // - 83/2
1/6*x = -83/2 // : 1/6
x = -83/2/1/6
x = -249
x = -249
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