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y-4 = (2/3)*(x-9) // - (2/3)*(x-9)
y-((2/3)*(x-9))-4 = 0
(-2/3)*(x-9)+y-4 = 0
y-2/3*(x-9)-4 = 0
y-2/3*(x-9)-4 = 0
y-2/3*x-4+6 = 0
y-2/3*x+2 = 0
y-2/3*x+2 = 0
y-2/3*x+2 = 0 // - y+2
-2/3*x = -(y+2) // : -2/3
x = (-(y+2))/(-2/3)
x = 3/2*(y+2)
x = 3/2*(y+2)
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