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x in (-oo:+oo)
y = -9*x-(-8.6*(1/4)) // + -9*x-(-8.6*(1/4))
y-(-9*x)-8.6*(1/4) = 0
9*x+y-8.6*(1/4) = 0
9*x+y-2.15 = 0 // - y-2.15
9*x = -(y-2.15) // : 9
x = (-(y-2.15))/9
x = (2.15-y)/9
x = (2.15-y)/9
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