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(1/3)*(2*x-15)+1/3 = 31/2 // - 31/2
(1/3)*(2*x-15)+1/3-(31/2) = 0
(1/3)*(2*x-15)+1/3-31/2 = 0
1/3*(2*x-15)+1/3-31/2 = 0
(1/3*2*3*(2*x-15))/(2*3)+(1*2)/(2*3)+(-31*3)/(2*3) = 0
1/3*2*3*(2*x-15)+1*2-31*3 = 0
4*x-93-28 = 0
4*x-121 = 0
(4*x-121)/(2*3) = 0
(4*x-121)/(2*3) = 0 // * 2*3
4*x-121 = 0
4*x-121 = 0 // + 121
4*x = 121 // : 4
x = 121/4
x = 121/4
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