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Y+6 = (3/2)*(x-9) // - (3/2)*(x-9)
Y-((3/2)*(x-9))+6 = 0
(-3/2)*(x-9)+Y+6 = 0
Y-3/2*(x-9)+6 = 0
Y-3/2*(x-9)+6 = 0
Y-3/2*x+6+27/2 = 0
Y-3/2*x+39/2 = 0
Y-3/2*x+39/2 = 0
Y-3/2*x+39/2 = 0 // - Y+39/2
-3/2*x = -(Y+39/2) // : -3/2
x = (-(Y+39/2))/(-3/2)
x = 2/3*(Y+39/2)
x = 2/3*(Y+39/2)
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