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4(u+5)=7u+2
We move all terms to the left:
4(u+5)-(7u+2)=0
We multiply parentheses
4u-(7u+2)+20=0
We get rid of parentheses
4u-7u-2+20=0
We add all the numbers together, and all the variables
-3u+18=0
We move all terms containing u to the left, all other terms to the right
-3u=-18
u=-18/-3
u=+6
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