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x in (-oo:+oo)
Y = (1/4)*x-45 // - (1/4)*x-45
Y-((1/4)*x)+45 = 0
Y+(-1/4)*x+45 = 0
Y-1/4*x+45 = 0 // - Y+45
-1/4*x = -(Y+45) // : -1/4
x = (-(Y+45))/(-1/4)
x = 4*(Y+45)
x = 4*(Y+45)
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