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(2/5)*x+5/10 = (13/2)*x+7/5 // - (13/2)*x+7/5
(2/5)*x-((13/2)*x)+5/10-(7/5) = 0
(2/5)*x+(-13/2)*x+5/10-7/5 = 0
-61/10*x-9/10 = 0 // + 9/10
-61/10*x = 9/10 // : -61/10
x = 9/10/(-61/10)
x = -9/61
x = -9/61
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