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x in (-oo:+oo)
(1/3)*(3*x-30) = 3*x // - 3*x
(1/3)*(3*x-30)-(3*x) = 0
(1/3)*(3*x-30)-3*x = 0
1/3*(3*x-30)-3*x = 0
1/3*(3*x-30)-3*x = 0
-2*x-10 = 0
-2*x-10 = 0
-2*x-10 = 0 // + 10
-2*x = 10 // : -2
x = 10/(-2)
x = -5
x = -5
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