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(3/5)*(x-15) = (2/3)*(x-6) // - (2/3)*(x-6)
(3/5)*(x-15)-((2/3)*(x-6)) = 0
(3/5)*(x-15)+(-2/3)*(x-6) = 0
3/5*(x-15)-2/3*(x-6) = 0
3/5*(x-15)-2/3*(x-6) = 0
-1/15*x-5 = 0
-1/15*x-5 = 0
-1/15*x-5 = 0 // + 5
-1/15*x = 5 // : -1/15
x = 5/(-1/15)
x = -75
x = -75
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