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