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(9/5)*x+15 = 5*x-(2/5)+3 // - 5*x-(2/5)+3
(9/5)*x-(5*x)+2/5-3+15 = 0
(9/5)*x-5*x+2/5-3+15 = 0
62/5-16/5*x = 0 // - 62/5
-16/5*x = -62/5 // : -16/5
x = -62/5/(-16/5)
x = 31/8
x = 31/8
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