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3/5 = (13/4)*x+3 // - (13/4)*x+3
3/5-((13/4)*x)-3 = 0
(-13/4)*x+3/5-3 = 0
-13/4*x-12/5 = 0 // + 12/5
-13/4*x = 12/5 // : -13/4
x = 12/5/(-13/4)
x = -48/65
x = -48/65
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