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