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(1/3)*(2*x-15)+(1/3)*x = 31/3 // - 31/3
(1/3)*(2*x-15)+(1/3)*x-(31/3) = 0
(1/3)*(2*x-15)+(1/3)*x-31/3 = 0
1/3*(2*x-15)+x/3-31/3 = 0
(1/3*3*(2*x-15))/3+x/3-31/3 = 0
1/3*3*(2*x-15)+x-31 = 0
3*x-31-15 = 0
3*x-46 = 0
(3*x-46)/3 = 0
(3*x-46)/3 = 0 // * 3
3*x-46 = 0
3*x-46 = 0 // + 46
3*x = 46 // : 3
x = 46/3
x = 46/3
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