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x in (-oo:+oo)
y/5-(x/5) = 65 // - 65
y/5-(x/5)-65 = 0
1/5*y-1/5*x-65 = 0 // - 1/5*y-65
-1/5*x = -(1/5*y-65) // : -1/5
x = (-(1/5*y-65))/(-1/5)
x = -5*(65-(1/5*y))
x = -5*(65-(1/5*y))
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