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(1/3)*(x-15)+2*x = 16 // - 16
(1/3)*(x-15)+2*x-16 = 0
1/3*(x-15)+2*x-16 = 0
1/3*(x-15)+2*x-16 = 0
7/3*x-16-5 = 0
7/3*x-21 = 0
7/3*x-21 = 0
7/3*x-21 = 0 // + 21
7/3*x = 21 // : 7/3
x = 21/7/3
x = 9
x = 9
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