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Y-7 = (-2/3)*(x-3) // - (-2/3)*(x-3)
Y-((-2/3)*(x-3))-7 = 0
(2/3)*(x-3)+Y-7 = 0
2/3*(x-3)+Y-7 = 0
2/3*(x-3)+Y-7 = 0
Y+2/3*x-7-2 = 0
Y+2/3*x-9 = 0
Y+2/3*x-9 = 0
Y+2/3*x-9 = 0 // - Y-9
2/3*x = -(Y-9) // : 2/3
x = (-(Y-9))/2/3
x = 3/2*(9-Y)
x = 3/2*(9-Y)
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