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x in (-oo:+oo)
(5/6)*x-((1/6)*x)+18 = 6 // - 6
(5/6)*x-((1/6)*x)-6+18 = 0
(5/6)*x+(-1/6)*x-6+18 = 0
2/3*x+12 = 0 // - 12
2/3*x = -12 // : 2/3
x = -12/2/3
x = -18
x = -18
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