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x in (-oo:+oo)
y = (9/2)*x-27 // - (9/2)*x-27
y-((9/2)*x)+27 = 0
(-9/2)*x+y+27 = 0
y-9/2*x+27 = 0 // - y+27
-9/2*x = -(y+27) // : -9/2
x = (-(y+27))/(-9/2)
x = 2/9*(y+27)
x = 2/9*(y+27)
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