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x in (-oo:+oo)
Y = (-1/2)*x+5 // - (-1/2)*x+5
Y-((-1/2)*x)-5 = 0
Y+(1/2)*x-5 = 0
Y+1/2*x-5 = 0 // - Y-5
1/2*x = -(Y-5) // : 1/2
x = (-(Y-5))/1/2
x = 2*(5-Y)
x = 2*(5-Y)
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