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-4 = (-3/5)*x // - (-3/5)*x
-((-3/5)*x)-4 = 0
(3/5)*x-4 = 0
3/5*x-4 = 0 // + 4
3/5*x = 4 // : 3/5
x = 4/3/5
x = 20/3
x = 20/3
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