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7=4u+5
We move all terms to the left:
7-(4u+5)=0
We get rid of parentheses
-4u-5+7=0
We add all the numbers together, and all the variables
-4u+2=0
We move all terms containing u to the left, all other terms to the right
-4u=-2
u=-2/-4
u=1/2
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