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43=7-6u
We move all terms to the left:
43-(7-6u)=0
We add all the numbers together, and all the variables
-(-6u+7)+43=0
We get rid of parentheses
6u-7+43=0
We add all the numbers together, and all the variables
6u+36=0
We move all terms containing u to the left, all other terms to the right
6u=-36
u=-36/6
u=-6
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