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