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x in (-oo:+oo)
Y-9 = (1/2)*(x-10) // - (1/2)*(x-10)
Y-((1/2)*(x-10))-9 = 0
(-1/2)*(x-10)+Y-9 = 0
Y-1/2*(x-10)-9 = 0
Y-1/2*(x-10)-9 = 0
Y-1/2*x-9+5 = 0
Y-1/2*x-4 = 0
Y-1/2*x-4 = 0
Y-1/2*x-4 = 0 // - Y-4
-1/2*x = -(Y-4) // : -1/2
x = (-(Y-4))/(-1/2)
x = -2*(4-Y)
x = -2*(4-Y)
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