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(3/20)*x = 1-((1/4)*y) // - 1-((1/4)*y)
(3/20)*x+(1/4)*y-1 = 0
3/20*x+1/4*y-1 = 0 // - 1/4*y-1
3/20*x = -(1/4*y-1) // : 3/20
x = (-(1/4*y-1))/3/20
x = 20/3*(1-(1/4*y))
x = 20/3*(1-(1/4*y))
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