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4(u+5)-2u=30
We move all terms to the left:
4(u+5)-2u-(30)=0
We add all the numbers together, and all the variables
-2u+4(u+5)-30=0
We multiply parentheses
-2u+4u+20-30=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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