According to the given data we have the following equation:
-3u-3=6
So, to find the value of 7u+1 we would have to calculate first the u at the equation above.
So, if -3u-3=6
Then -3u=6+3
-3u=9
u=9/-3
u=-3
Hence, if u=-3 in order to calculate the value of 7u+1 we would have to substitute the value of u at 7u+1 as follows:
7(-3) + 1
=-21 + 1
=-20
Therefore, the value of 7u+1 would be -20.