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3u+40+3u=6u-30-u
We move all terms to the left:
3u+40+3u-(6u-30-u)=0
We add all the numbers together, and all the variables
3u+3u-(5u-30)+40=0
We add all the numbers together, and all the variables
6u-(5u-30)+40=0
We get rid of parentheses
6u-5u+30+40=0
We add all the numbers together, and all the variables
u+70=0
We move all terms containing u to the left, all other terms to the right
u=-70
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