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(3/5)*x-(8/15) = 4 // - 4
(3/5)*x-(8/15)-4 = 0
(3/5)*x-8/15-4 = 0
3/5*x-68/15 = 0 // + 68/15
3/5*x = 68/15 // : 3/5
x = 68/15/3/5
x = 68/9
x = 68/9
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