Answer:
u=6
Step-by-step explanation:
5u+3=-3u-1=8
COMBINE LIKE TERMS(so 5u and -3u and then combine your positive 4 and your negative 1 then bring down your 8
2u-4=8
opposite inverse so add 4 to 8
2u=12
divide 2 into 12
u=6
so your final answer is 6.