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(2/3)*(x-6) = (4/5)*x-1 // - (4/5)*x-1
(2/3)*(x-6)-((4/5)*x)+1 = 0
(2/3)*(x-6)+(-4/5)*x+1 = 0
2/3*(x-6)+(-4*x)/5+1 = 0
(2/3*5*(x-6))/5+(-4*x)/5+(1*5)/5 = 0
2/3*5*(x-6)-4*x+1*5 = 0
5-2/3*x-20 = 0
-2/3*x-15 = 0
(-2/3*x-15)/5 = 0
(-2/3*x-15)/5 = 0 // * 5
-2/3*x-15 = 0
-2/3*x-15 = 0 // + 15
-2/3*x = 15 // : -2/3
x = 15/(-2/3)
x = -45/2
x = -45/2
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