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y-4 = (-1/2)*(x-6) // - (-1/2)*(x-6)
y-((-1/2)*(x-6))-4 = 0
(1/2)*(x-6)+y-4 = 0
1/2*(x-6)+y-4 = 0
1/2*(x-6)+y-4 = 0
1/2*x+y-4-3 = 0
1/2*x+y-7 = 0
1/2*x+y-7 = 0
1/2*x+y-7 = 0 // - y-7
1/2*x = -(y-7) // : 1/2
x = (-(y-7))/1/2
x = 2*(7-y)
x = 2*(7-y)
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