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x in (-oo:+oo)
(4/60)*x+(8/60)*y = 3 // - 3
(4/60)*x+(8/60)*y-3 = 0
1/15*x+2/15*y-3 = 0 // - 2/15*y-3
1/15*x = -(2/15*y-3) // : 1/15
x = (-(2/15*y-3))/1/15
x = 15*(3-(2/15*y))
x = 15*(3-(2/15*y))
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