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Y-1 = (7/8)*(x-4) // - (7/8)*(x-4)
Y-((7/8)*(x-4))-1 = 0
(-7/8)*(x-4)+Y-1 = 0
Y-7/8*(x-4)-1 = 0
Y-7/8*(x-4)-1 = 0
Y-7/8*x-1+7/2 = 0
Y-7/8*x+5/2 = 0
Y-7/8*x+5/2 = 0
Y-7/8*x+5/2 = 0 // - Y+5/2
-7/8*x = -(Y+5/2) // : -7/8
x = (-(Y+5/2))/(-7/8)
x = 8/7*(Y+5/2)
x = 8/7*(Y+5/2)
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