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7=4u+43+4u
We move all terms to the left:
7-(4u+43+4u)=0
We add all the numbers together, and all the variables
-(8u+43)+7=0
We get rid of parentheses
-8u-43+7=0
We add all the numbers together, and all the variables
-8u-36=0
We move all terms containing u to the left, all other terms to the right
-8u=36
u=36/-8
u=-4+1/2
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