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(1/2)*(6*x-12) = 2*(4*x-5) // - 2*(4*x-5)
(1/2)*(6*x-12)-(2*(4*x-5)) = 0
(1/2)*(6*x-12)-2*(4*x-5) = 0
1/2*(6*x-12)-2*(4*x-5) = 0
1/2*(6*x-12)-2*(4*x-5) = 0
4-5*x = 0
4-5*x = 0
4-5*x = 0 // - 4
-5*x = -4 // : -5
x = -4/(-5)
x = 4/5
x = 4/5
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