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(3/5)*x-((8/15)*x) = 5 // - 5
(3/5)*x-((8/15)*x)-5 = 0
(3/5)*x+(-8/15)*x-5 = 0
1/15*x-5 = 0 // + 5
1/15*x = 5 // : 1/15
x = 5/1/15
x = 75
x = 75
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