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-2/5 = (-2/3)*x // - (-2/3)*x
-((-2/3)*x)-2/5 = 0
(2/3)*x-2/5 = 0
2/3*x-2/5 = 0 // + 2/5
2/3*x = 2/5 // : 2/3
x = 2/5/2/3
x = 3/5
x = 3/5
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