Question

Let b= 7.
3b+-4


Please help

Answer 1

b=40/63

Explanation:

b= 7. 3b+-4

multiply both sides by 10

b*10=7.3b*10-4*10

refine

b*10=7.3b-40

subtract 7.3b from both sides

b*10-7.3b=7.3b-40-7.3b

simplify

-63b=-40

divide both sides by -63

-63b/-63=-40/-63

simplify

b=40/63

sorry for the lengthy explanation

hope this helps :) have a nice day !! (please let me know if this was wrong)

Answer 2

3b+-4
3(7)+-4
21+-4
=17
Hope this helps have a nice day! ;$