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3*x-(15/2) = (4*x)/5 // - (4*x)/5
3*x-((4*x)/5)-(15/2) = 0
3*x+(-4/5)*x-15/2 = 0
11/5*x-15/2 = 0 // + 15/2
11/5*x = 15/2 // : 11/5
x = 15/2/11/5
x = 75/22
x = 75/22
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