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x in (-oo:+oo)
Y = (9/10)*x-5 // - (9/10)*x-5
Y-((9/10)*x)+5 = 0
Y+(-9/10)*x+5 = 0
Y-9/10*x+5 = 0 // - Y+5
-9/10*x = -(Y+5) // : -9/10
x = (-(Y+5))/(-9/10)
x = 10/9*(Y+5)
x = 10/9*(Y+5)
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