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x in (-oo:+oo)
x/5-(y/9) = 1 // - 1
x/5-(y/9)-1 = 0
1/5*x-1/9*y-1 = 0 // + -1/9*y-1
1/5*x = -(-1/9*y-1) // : 1/5
x = (-(-1/9*y-1))/1/5
x = 5*(1-(-1/9*y))
x = 5*(1-(-1/9*y))
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