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(2/3)*(x-6) = (4/5)*(x-4) // - (4/5)*(x-4)
(2/3)*(x-6)-((4/5)*(x-4)) = 0
(2/3)*(x-6)+(-4/5)*(x-4) = 0
2/3*(x-6)-4/5*(x-4) = 0
2/3*(x-6)-4/5*(x-4) = 0
-2/15*x-4/5 = 0
-2/15*x-4/5 = 0
-2/15*x-4/5 = 0 // + 4/5
-2/15*x = 4/5 // : -2/15
x = 4/5/(-2/15)
x = -6
x = -6
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