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x in (-oo:+oo)
y = 20-(x/10) // - 20-(x/10)
x/10+y-20 = 0
1/10*x+y-20 = 0 // - y-20
1/10*x = -(y-20) // : 1/10
x = (-(y-20))/1/10
x = 10*(20-y)
x = 10*(20-y)
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