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x in (-oo:+oo)
(1/6)*(12-(6*x)) = 5*(1+4) // - 5*(1+4)
(1/6)*(12-(6*x))-(5*(1+4)) = 0
(1/6)*(12-6*x)-5*(1+4) = 0
1/6*(12-6*x)-25 = 0
1/6*(12-6*x)-25 = 0
-x-23 = 0
-x-23 = 0
-x-23 = 0 // + 23
-x = 23 // * -1
x = -23
x = -23
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