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8u+30=3u+70
We move all terms to the left:
8u+30-(3u+70)=0
We get rid of parentheses
8u-3u-70+30=0
We add all the numbers together, and all the variables
5u-40=0
We move all terms containing u to the left, all other terms to the right
5u=40
u=40/5
u=8
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