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(1/3)*(2*x-15)+(1/3)*x = 3*(1/2) // - 3*(1/2)
(1/3)*(2*x-15)+(1/3)*x-(3*(1/2)) = 0
(1/3)*(2*x-15)+(1/3)*x-3/2 = 0
1/3*(2*x-15)+x/3-3/2 = 0
(1/3*2*3*(2*x-15))/(2*3)+(2*x)/(2*3)+(-3*3)/(2*3) = 0
1/3*2*3*(2*x-15)+2*x-3*3 = 0
6*x-30-9 = 0
6*x-39 = 0
(6*x-39)/(2*3) = 0
(6*x-39)/(2*3) = 0 // * 2*3
6*x-39 = 0
6*x-39 = 0 // + 39
6*x = 39 // : 6
x = 39/6
x = 13/2
x = 13/2
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