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20 = (-3/5)*x // - (-3/5)*x
20-((-3/5)*x) = 0
(3/5)*x+20 = 0
3/5*x+20 = 0 // - 20
3/5*x = -20 // : 3/5
x = -20/3/5
x = -100/3
x = -100/3
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