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Y-9 = (-3/7)*(x-4) // - (-3/7)*(x-4)
Y-((-3/7)*(x-4))-9 = 0
(3/7)*(x-4)+Y-9 = 0
3/7*(x-4)+Y-9 = 0
3/7*(x-4)+Y-9 = 0
Y+3/7*x-9-12/7 = 0
Y+3/7*x-75/7 = 0
Y+3/7*x-75/7 = 0
Y+3/7*x-75/7 = 0 // - Y-75/7
3/7*x = -(Y-75/7) // : 3/7
x = (-(Y-75/7))/3/7
x = 7/3*(75/7-Y)
x = 7/3*(75/7-Y)
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