Question

7+4u=70-3u
What is U

Answer 1

7+4u= 70-3u
add 3u to both sides
7+7u=70
subtract 7 from both sides
7u=63
divide both sides by 7
u= 9

hope this helps

Answer 2

`7+4u=70-3u \\ 7+4u+3u=70-3u+3u \\ 7+7u=70 \\ 7-7+7u=70-7 \\ 7u=63 \\ 7u/7=63/7 \\ u=9`
u=9 is your answer.
Hope this helps!