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x in (-oo:+oo)
(1/7)*x-((1/4)*x) = 12 // - 12
(1/7)*x-((1/4)*x)-12 = 0
(1/7)*x+(-1/4)*x-12 = 0
-3/28*x-12 = 0 // + 12
-3/28*x = 12 // : -3/28
x = 12/(-3/28)
x = -112
x = -112
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