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x in (-oo:+oo)
(4/5)*x+y = 27 // - 27
(4/5)*x+y-27 = 0
4/5*x+y-27 = 0 // - y-27
4/5*x = -(y-27) // : 4/5
x = (-(y-27))/4/5
x = 5/4*(27-y)
x = 5/4*(27-y)
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