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x in (-oo:+oo)
(1/3)*(x-3) = 9 // - 9
(1/3)*(x-3)-9 = 0
1/3*(x-3)-9 = 0
1/3*(x-3)-9 = 0
1/3*x-10 = 0
1/3*x-10 = 0
1/3*x-10 = 0 // + 10
1/3*x = 10 // : 1/3
x = 10/1/3
x = 30
x = 30
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