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4u=-20+2u
We move all terms to the left:
4u-(-20+2u)=0
We add all the numbers together, and all the variables
4u-(2u-20)=0
We get rid of parentheses
4u-2u+20=0
We add all the numbers together, and all the variables
2u+20=0
We move all terms containing u to the left, all other terms to the right
2u=-20
u=-20/2
u=-10
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