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x in (-oo:+oo)
(1/4)*x = 60-y // - 60-y
(1/4)*x+y-60 = 0
1/4*x+y-60 = 0 // - y-60
1/4*x = -(y-60) // : 1/4
x = (-(y-60))/1/4
x = 4*(60-y)
x = 4*(60-y)
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