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(13/2)*x-(4/15) = (31/6)*x // - (31/6)*x
(13/2)*x-((31/6)*x)-(4/15) = 0
(13/2)*x+(-31/6)*x-4/15 = 0
4/3*x-4/15 = 0 // + 4/15
4/3*x = 4/15 // : 4/3
x = 4/15/4/3
x = 1/5
x = 1/5
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