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-83=4u+8u+13
We move all terms to the left:
-83-(4u+8u+13)=0
We add all the numbers together, and all the variables
-(12u+13)-83=0
We get rid of parentheses
-12u-13-83=0
We add all the numbers together, and all the variables
-12u-96=0
We move all terms containing u to the left, all other terms to the right
-12u=96
u=96/-12
u=-8
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