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x in (-oo:+oo)
y-6.75 = (-1/4)*x // - (-1/4)*x
y-((-1/4)*x)-6.75 = 0
(1/4)*x+y-6.75 = 0
1/4*x+y-6.75 = 0 // - y-6.75
1/4*x = -(y-6.75) // : 1/4
x = (-(y-6.75))/1/4
x = 4*(6.75-y)
x = 4*(6.75-y)
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