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Y-6 = (-2/7)*(x-4) // - (-2/7)*(x-4)
Y-((-2/7)*(x-4))-6 = 0
(2/7)*(x-4)+Y-6 = 0
2/7*(x-4)+Y-6 = 0
2/7*(x-4)+Y-6 = 0
Y+2/7*x-6-8/7 = 0
Y+2/7*x-50/7 = 0
Y+2/7*x-50/7 = 0
Y+2/7*x-50/7 = 0 // - Y-50/7
2/7*x = -(Y-50/7) // : 2/7
x = (-(Y-50/7))/2/7
x = 7/2*(50/7-Y)
x = 7/2*(50/7-Y)
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