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x in (-oo:+oo)
Y-6 = (1/2)*(x-3) // - (1/2)*(x-3)
Y-((1/2)*(x-3))-6 = 0
(-1/2)*(x-3)+Y-6 = 0
Y-1/2*(x-3)-6 = 0
Y-1/2*(x-3)-6 = 0
Y-1/2*x-6+3/2 = 0
Y-1/2*x-9/2 = 0
Y-1/2*x-9/2 = 0
Y-1/2*x-9/2 = 0 // - Y-9/2
-1/2*x = -(Y-9/2) // : -1/2
x = (-(Y-9/2))/(-1/2)
x = -2*(9/2-Y)
x = -2*(9/2-Y)
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