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x in (-oo:+oo)
y = (-4/7)*x-(1/2) // - (-4/7)*x-(1/2)
y-((-4/7)*x)+1/2 = 0
(4/7)*x+y+1/2 = 0
4/7*x+y+1/2 = 0 // - y+1/2
4/7*x = -(y+1/2) // : 4/7
x = (-(y+1/2))/4/7
x = -7/4*(y+1/2)
x = -7/4*(y+1/2)
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