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Y-6 = (-2/3)*(x+7) // - (-2/3)*(x+7)
Y-((-2/3)*(x+7))-6 = 0
(2/3)*(x+7)+Y-6 = 0
2/3*(x+7)+Y-6 = 0
2/3*(x+7)+Y-6 = 0
Y+2/3*x-6+14/3 = 0
Y+2/3*x-4/3 = 0
Y+2/3*x-4/3 = 0
Y+2/3*x-4/3 = 0 // - Y-4/3
2/3*x = -(Y-4/3) // : 2/3
x = (-(Y-4/3))/2/3
x = 3/2*(4/3-Y)
x = 3/2*(4/3-Y)
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