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6u+20=4u+30
We move all terms to the left:
6u+20-(4u+30)=0
We get rid of parentheses
6u-4u-30+20=0
We add all the numbers together, and all the variables
2u-10=0
We move all terms containing u to the left, all other terms to the right
2u=10
u=10/2
u=5
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