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Y-3 = (8/9)*(x-4) // - (8/9)*(x-4)
Y-((8/9)*(x-4))-3 = 0
(-8/9)*(x-4)+Y-3 = 0
Y-8/9*(x-4)-3 = 0
Y-8/9*(x-4)-3 = 0
Y-8/9*x-3+32/9 = 0
Y-8/9*x+5/9 = 0
Y-8/9*x+5/9 = 0
Y-8/9*x+5/9 = 0 // - Y+5/9
-8/9*x = -(Y+5/9) // : -8/9
x = (-(Y+5/9))/(-8/9)
x = 9/8*(Y+5/9)
x = 9/8*(Y+5/9)
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