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(2/3)*(x+1) = 10 // - 10
(2/3)*(x+1)-10 = 0
2/3*(x+1)-10 = 0
2/3*(x+1)-10 = 0
2/3*x-28/3 = 0
2/3*x-28/3 = 0
2/3*x-28/3 = 0 // + 28/3
2/3*x = 28/3 // : 2/3
x = 28/3/2/3
x = 14
x = 14
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