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