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(1/5)*(3*x+36) = 3*x // - 3*x
(1/5)*(3*x+36)-(3*x) = 0
(1/5)*(3*x+36)-3*x = 0
1/5*(3*x+36)-3*x = 0
1/5*(3*x+36)-3*x = 0
36/5-12/5*x = 0
36/5-12/5*x = 0
36/5-12/5*x = 0 // - 36/5
-12/5*x = -36/5 // : -12/5
x = -36/5/(-12/5)
x = 3
x = 3
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