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x in (-oo:+oo)
(1/6)*x+(1/12)*x+(1/7)*x+(1/2)*x+4+5 = x // - x
(1/6)*x+(1/12)*x+(1/7)*x+(1/2)*x-x+4+5 = 0
9-3/28*x = 0 // - 9
-3/28*x = -9 // : -3/28
x = -9/(-3/28)
x = 84
x = 84
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