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-8u-5u+7=-7u=7
We move all terms to the left:
-8u-5u+7-(-7u)=0
We add all the numbers together, and all the variables
-13u-(-7u)+7=0
We get rid of parentheses
-13u+7u+7=0
We add all the numbers together, and all the variables
-6u+7=0
We move all terms containing u to the left, all other terms to the right
-6u=-7
u=-7/-6
u=1+1/6
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