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x in (-oo:+oo)
y-200 = (-2/3)*x // - (-2/3)*x
y-((-2/3)*x)-200 = 0
(2/3)*x+y-200 = 0
2/3*x+y-200 = 0 // - y-200
2/3*x = -(y-200) // : 2/3
x = (-(y-200))/2/3
x = 3/2*(200-y)
x = 3/2*(200-y)
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