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Y-10 = (-10/8)*(x-6) // - (-10/8)*(x-6)
Y-((-10/8)*(x-6))-10 = 0
(5/4)*(x-6)+Y-10 = 0
5/4*(x-6)+Y-10 = 0
5/4*(x-6)+Y-10 = 0
Y+5/4*x-10-15/2 = 0
Y+5/4*x-35/2 = 0
Y+5/4*x-35/2 = 0
Y+5/4*x-35/2 = 0 // - Y-35/2
5/4*x = -(Y-35/2) // : 5/4
x = (-(Y-35/2))/5/4
x = 4/5*(35/2-Y)
x = 4/5*(35/2-Y)
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