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(1/3)*(x-13) = 14 // - 14
(1/3)*(x-13)-14 = 0
1/3*(x-13)-14 = 0
1/3*(x-13)-14 = 0
1/3*x-55/3 = 0
1/3*x-55/3 = 0
1/3*x-55/3 = 0 // + 55/3
1/3*x = 55/3 // : 1/3
x = 55/3/1/3
x = 55
x = 55
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