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x in (-oo:+oo)
y+1 = (-1/4)*x+7*(1/4) // - (-1/4)*x+7*(1/4)
y-((-1/4)*x)-(7*(1/4))+1 = 0
(1/4)*x+y-7/4+1 = 0
1/4*x+y-3/4 = 0 // - y-3/4
1/4*x = -(y-3/4) // : 1/4
x = (-(y-3/4))/1/4
x = 4*(3/4-y)
x = 4*(3/4-y)
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