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(1/3)*(3*x+15) = (2/3)*x+3 // - (2/3)*x+3
(1/3)*(3*x+15)-((2/3)*x)-3 = 0
(1/3)*(3*x+15)+(-2/3)*x-3 = 0
1/3*(3*x+15)+(-2*x)/3-3 = 0
(1/3*3*(3*x+15))/3+(-2*x)/3+(-3*3)/3 = 0
1/3*3*(3*x+15)-2*x-3*3 = 0
x-9+15 = 0
x+6 = 0
(x+6)/3 = 0
(x+6)/3 = 0 // * 3
x+6 = 0
x+6 = 0 // - 6
x = -6
x = -6
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