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5/3 = (13/4)*x+3 // - (13/4)*x+3
5/3-((13/4)*x)-3 = 0
(-13/4)*x+5/3-3 = 0
-13/4*x-4/3 = 0 // + 4/3
-13/4*x = 4/3 // : -13/4
x = 4/3/(-13/4)
x = -16/39
x = -16/39
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