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