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y-4 = (-1/4)*(x-2) // - (-1/4)*(x-2)
y-((-1/4)*(x-2))-4 = 0
(1/4)*(x-2)+y-4 = 0
1/4*(x-2)+y-4 = 0
1/4*(x-2)+y-4 = 0
1/4*x+y-4-1/2 = 0
1/4*x+y-9/2 = 0
1/4*x+y-9/2 = 0
1/4*x+y-9/2 = 0 // - y-9/2
1/4*x = -(y-9/2) // : 1/4
x = (-(y-9/2))/1/4
x = 4*(9/2-y)
x = 4*(9/2-y)
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