12-3u=-21

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Solution for 12-3u=-21 equation:


12-3u=-21

We simplify the equation to the form, which is simple to understand 
12-3u=-21

We move all terms containing u to the left and all other terms to the right. 
-3u=-21-12

We simplify left and right side of the equation. 
-3u=-33

We divide both sides of the equation by -3 to get u. 
u=11

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