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x in (-oo:+oo)
Y-2 = (1/2)*(x-7) // - (1/2)*(x-7)
Y-((1/2)*(x-7))-2 = 0
(-1/2)*(x-7)+Y-2 = 0
Y-1/2*(x-7)-2 = 0
Y-1/2*(x-7)-2 = 0
Y-1/2*x-2+7/2 = 0
Y-1/2*x+3/2 = 0
Y-1/2*x+3/2 = 0
Y-1/2*x+3/2 = 0 // - Y+3/2
-1/2*x = -(Y+3/2) // : -1/2
x = (-(Y+3/2))/(-1/2)
x = 2*(Y+3/2)
x = 2*(Y+3/2)
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