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