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x in (-oo:+oo)
y = -((7*x)/(-1))-4 // + -((7*x)/(-1))-4
(7*x)/(-1)+y+4 = 0
y-7*x+4 = 0
y-7*x+4 = 0 // - y+4
-7*x = -(y+4) // : -7
x = (-(y+4))/(-7)
x = (y+4)/7
x = (y+4)/7
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