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12-6u=-13-u
We simplify the equation to the form, which is simple to understand
12-6u=-13-u
We move all terms containing u to the left and all other terms to the right.
-6u+1u=-13-12
We simplify left and right side of the equation.
-5u=-25
We divide both sides of the equation by -5 to get u.
u=5
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