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(2/3)*(x+11) = 13 // - 13
(2/3)*(x+11)-13 = 0
2/3*(x+11)-13 = 0
2/3*(x+11)-13 = 0
2/3*x-17/3 = 0
2/3*x-17/3 = 0
2/3*x-17/3 = 0 // + 17/3
2/3*x = 17/3 // : 2/3
x = 17/3/2/3
x = 17/2
x = 17/2
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