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x in (-oo:+oo)
y = 7*x-(5/14) // - 7*x-(5/14)
y-(7*x)+5/14 = 0
y-7*x+5/14 = 0
y-7*x+5/14 = 0 // - y+5/14
-7*x = -(y+5/14) // : -7
x = (-(y+5/14))/(-7)
x = (y+5/14)/7
x = (y+5/14)/7
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