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(5/7)*(x+14) = 15 // - 15
(5/7)*(x+14)-15 = 0
5/7*(x+14)-15 = 0
5/7*(x+14)-15 = 0
5/7*x-5 = 0
5/7*x-5 = 0
5/7*x-5 = 0 // + 5
5/7*x = 5 // : 5/7
x = 5/5/7
x = 7
x = 7
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