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