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540=25u+148+49+u+23u+u+43
We move all terms to the left:
540-(25u+148+49+u+23u+u+43)=0
We add all the numbers together, and all the variables
-(50u+240)+540=0
We get rid of parentheses
-50u-240+540=0
We add all the numbers together, and all the variables
-50u+300=0
We move all terms containing u to the left, all other terms to the right
-50u=-300
u=-300/-50
u=+6
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