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