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Y+4 = (8/9)*(x-6) // - (8/9)*(x-6)
Y-((8/9)*(x-6))+4 = 0
(-8/9)*(x-6)+Y+4 = 0
Y-8/9*(x-6)+4 = 0
Y-8/9*(x-6)+4 = 0
Y-8/9*x+4+16/3 = 0
Y-8/9*x+28/3 = 0
Y-8/9*x+28/3 = 0
Y-8/9*x+28/3 = 0 // - Y+28/3
-8/9*x = -(Y+28/3) // : -8/9
x = (-(Y+28/3))/(-8/9)
x = 9/8*(Y+28/3)
x = 9/8*(Y+28/3)
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