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