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x in (-oo:+oo)
(1/4)*x-((1/6)*x) = 6 // - 6
(1/4)*x-((1/6)*x)-6 = 0
(1/4)*x+(-1/6)*x-6 = 0
1/12*x-6 = 0 // + 6
1/12*x = 6 // : 1/12
x = 6/1/12
x = 72
x = 72
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