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x in (-oo:+oo)
(1/3)*(12-(9*x)) = 19 // - 19
(1/3)*(12-(9*x))-19 = 0
(1/3)*(12-9*x)-19 = 0
1/3*(12-9*x)-19 = 0
1/3*(12-9*x)-19 = 0
-3*x-15 = 0
-3*x-15 = 0
-3*x-15 = 0 // + 15
-3*x = 15 // : -3
x = 15/(-3)
x = -5
x = -5
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