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(2*x)/5 = (1/3)*(2*x-12) // - (1/3)*(2*x-12)
(2*x)/5-((1/3)*(2*x-12)) = 0
(-1/3)*(2*x-12)+(2*x)/5 = 0
(2*x)/5-1/3*(2*x-12) = 0
(-1/3*5*(2*x-12))/5+(2*x)/5 = 0
2*x-1/3*5*(2*x-12) = 0
20-4/3*x = 0
(20-4/3*x)/5 = 0
(20-4/3*x)/5 = 0 // * 5
20-4/3*x = 0
20-4/3*x = 0 // - 20
-4/3*x = -20 // : -4/3
x = -20/(-4/3)
x = 15
x = 15
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