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2u+51=2u+2u
We move all terms to the left:
2u+51-(2u+2u)=0
We add all the numbers together, and all the variables
2u-(+4u)+51=0
We get rid of parentheses
2u-4u+51=0
We add all the numbers together, and all the variables
-2u+51=0
We move all terms containing u to the left, all other terms to the right
-2u=-51
u=-51/-2
u=25+1/2
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