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x in (-oo:+oo)
(2*y)/3-(x/4) = 140 // - 140
(2*y)/3-(x/4)-140 = 0
2/3*y-1/4*x-140 = 0 // - 2/3*y-140
-1/4*x = -(2/3*y-140) // : -1/4
x = (-(2/3*y-140))/(-1/4)
x = -4*(140-(2/3*y))
x = -4*(140-(2/3*y))
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