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Y-3 = (-4/3)*(x-9) // - (-4/3)*(x-9)
Y-((-4/3)*(x-9))-3 = 0
(4/3)*(x-9)+Y-3 = 0
4/3*(x-9)+Y-3 = 0
4/3*(x-9)+Y-3 = 0
Y+4/3*x-12-3 = 0
Y+4/3*x-15 = 0
Y+4/3*x-15 = 0
Y+4/3*x-15 = 0 // - Y-15
4/3*x = -(Y-15) // : 4/3
x = (-(Y-15))/4/3
x = 3/4*(15-Y)
x = 3/4*(15-Y)
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