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(5/9)*(x-3) = 15 // - 15
(5/9)*(x-3)-15 = 0
5/9*(x-3)-15 = 0
5/9*(x-3)-15 = 0
5/9*x-50/3 = 0
5/9*x-50/3 = 0
5/9*x-50/3 = 0 // + 50/3
5/9*x = 50/3 // : 5/9
x = 50/3/5/9
x = 30
x = 30
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