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x in (-oo:+oo)
y = (9/10)*x-2 // - (9/10)*x-2
y-((9/10)*x)+2 = 0
(-9/10)*x+y+2 = 0
y-9/10*x+2 = 0 // - y+2
-9/10*x = -(y+2) // : -9/10
x = (-(y+2))/(-9/10)
x = 10/9*(y+2)
x = 10/9*(y+2)
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