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Y-3 = (-1/3)*(x-4) // - (-1/3)*(x-4)
Y-((-1/3)*(x-4))-3 = 0
(1/3)*(x-4)+Y-3 = 0
1/3*(x-4)+Y-3 = 0
1/3*(x-4)+Y-3 = 0
Y+1/3*x-3-4/3 = 0
Y+1/3*x-13/3 = 0
Y+1/3*x-13/3 = 0
Y+1/3*x-13/3 = 0 // - Y-13/3
1/3*x = -(Y-13/3) // : 1/3
x = (-(Y-13/3))/1/3
x = 3*(13/3-Y)
x = 3*(13/3-Y)
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