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y-3 = (-1/2)*(x-6) // - (-1/2)*(x-6)
y-((-1/2)*(x-6))-3 = 0
(1/2)*(x-6)+y-3 = 0
1/2*(x-6)+y-3 = 0
1/2*(x-6)+y-3 = 0
1/2*x+y-3-3 = 0
1/2*x+y-6 = 0
1/2*x+y-6 = 0
1/2*x+y-6 = 0 // - y-6
1/2*x = -(y-6) // : 1/2
x = (-(y-6))/1/2
x = 2*(6-y)
x = 2*(6-y)
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