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X-2 = (-1/4)*(x-8) // - (-1/4)*(x-8)
X-((-1/4)*(x-8))-2 = 0
(1/4)*(x-8)+X-2 = 0
1/4*(x-8)+X-2 = 0
1/4*(x-8)+X-2 = 0
X+1/4*x-2-2 = 0
X+1/4*x-4 = 0
X+1/4*x-4 = 0
X+1/4*x-4 = 0 // - X-4
1/4*x = -(X-4) // : 1/4
x = (-(X-4))/1/4
x = 4*(4-X)
x = 4*(4-X)
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