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x in (-oo:+oo)
y = (5/7)*x+2/7 // - (5/7)*x+2/7
y-((5/7)*x)-(2/7) = 0
(-5/7)*x+y-2/7 = 0
y-5/7*x-2/7 = 0 // - y-2/7
-5/7*x = -(y-2/7) // : -5/7
x = (-(y-2/7))/(-5/7)
x = -7/5*(2/7-y)
x = -7/5*(2/7-y)
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