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5/6 = (-2/5)*x+(1/3)*x // - (-2/5)*x+(1/3)*x
5/6-((-2/5)*x)-((1/3)*x) = 0
(2/5)*x+(-1/3)*x+5/6 = 0
1/15*x+5/6 = 0 // - 5/6
1/15*x = -5/6 // : 1/15
x = -5/6/1/15
x = -25/2
x = -25/2
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