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x in (-oo:+oo)
x/4-(y/5) = 1 // - 1
x/4-(y/5)-1 = 0
1/4*x-1/5*y-1 = 0 // + -1/5*y-1
1/4*x = -(-1/5*y-1) // : 1/4
x = (-(-1/5*y-1))/1/4
x = 4*(1-(-1/5*y))
x = 4*(1-(-1/5*y))
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