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7-9u=-3-10u
We move all terms to the left:
7-9u-(-3-10u)=0
We add all the numbers together, and all the variables
-9u-(-10u-3)+7=0
We get rid of parentheses
-9u+10u+3+7=0
We add all the numbers together, and all the variables
u+10=0
We move all terms containing u to the left, all other terms to the right
u=-10
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