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x in (-oo:+oo)
y = (-2/7)*x+6 // - (-2/7)*x+6
y-((-2/7)*x)-6 = 0
(2/7)*x+y-6 = 0
2/7*x+y-6 = 0 // - y-6
2/7*x = -(y-6) // : 2/7
x = (-(y-6))/2/7
x = 7/2*(6-y)
x = 7/2*(6-y)
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