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56=-4u-3u
We move all terms to the left:
56-(-4u-3u)=0
We add all the numbers together, and all the variables
-(-7u)+56=0
We get rid of parentheses
7u+56=0
We move all terms containing u to the left, all other terms to the right
7u=-56
u=-56/7
u=-8
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