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x in (-oo:+oo)
y = (10/9)*x-20 // - (10/9)*x-20
y-((10/9)*x)+20 = 0
(-10/9)*x+y+20 = 0
y-10/9*x+20 = 0 // - y+20
-10/9*x = -(y+20) // : -10/9
x = (-(y+20))/(-10/9)
x = 9/10*(y+20)
x = 9/10*(y+20)
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