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-12=-32+4u
We move all terms to the left:
-12-(-32+4u)=0
We add all the numbers together, and all the variables
-(4u-32)-12=0
We get rid of parentheses
-4u+32-12=0
We add all the numbers together, and all the variables
-4u+20=0
We move all terms containing u to the left, all other terms to the right
-4u=-20
u=-20/-4
u=+5
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