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y-2 = (-1/3)*(x-4) // - (-1/3)*(x-4)
y-((-1/3)*(x-4))-2 = 0
(1/3)*(x-4)+y-2 = 0
1/3*(x-4)+y-2 = 0
1/3*(x-4)+y-2 = 0
1/3*x+y-2-4/3 = 0
1/3*x+y-10/3 = 0
1/3*x+y-10/3 = 0
1/3*x+y-10/3 = 0 // - y-10/3
1/3*x = -(y-10/3) // : 1/3
x = (-(y-10/3))/1/3
x = 3*(10/3-y)
x = 3*(10/3-y)
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