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(2/5)*x+7/5 = (5/4)*x+47/20+3/4 // - (5/4)*x+47/20+3/4
(2/5)*x-((5/4)*x)+7/5-(47/20)-(3/4) = 0
(2/5)*x+(-5/4)*x+7/5-47/20-3/4 = 0
-17/20*x-17/10 = 0 // + 17/10
-17/20*x = 17/10 // : -17/20
x = 17/10/(-17/20)
x = -2
x = -2
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