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