7+4u=70-3uWhat is U
\(7+4u=70-3u \\ 7+4u+3u=70-3u+3u \\ 7+7u=70 \\ 7-7+7u=70-7 \\ 7u=63 \\ 7u/7=63/7 \\ u=9\)u=9 is your answer.Hope this helps!
7+4u= 70-3uadd 3u to both sides7+7u=70subtract 7 from both sides 7u=63divide both sides by 7 u= 9hope this helps