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(1/3)*(x+2) = 15 // - 15
(1/3)*(x+2)-15 = 0
1/3*(x+2)-15 = 0
1/3*(x+2)-15 = 0
1/3*x-43/3 = 0
1/3*x-43/3 = 0
1/3*x-43/3 = 0 // + 43/3
1/3*x = 43/3 // : 1/3
x = 43/3/1/3
x = 43
x = 43
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