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x in (-oo:+oo)
y = (3/7)*x-(1/14) // - (3/7)*x-(1/14)
y-((3/7)*x)+1/14 = 0
(-3/7)*x+y+1/14 = 0
y-3/7*x+1/14 = 0 // - y+1/14
-3/7*x = -(y+1/14) // : -3/7
x = (-(y+1/14))/(-3/7)
x = 7/3*(y+1/14)
x = 7/3*(y+1/14)
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