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(5/3)*(x+4) = 15 // - 15
(5/3)*(x+4)-15 = 0
5/3*(x+4)-15 = 0
5/3*(x+4)-15 = 0
5/3*x-25/3 = 0
5/3*x-25/3 = 0
5/3*x-25/3 = 0 // + 25/3
5/3*x = 25/3 // : 5/3
x = 25/3/5/3
x = 5
x = 5
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