Question

What is 7a+21=56 and what is the solution

Answer 1

7a+21=56

Begin by subtracting 21 on both sides:
21-21=0 so the 21 in the left cancels, then 56-21=35

Your new equation will be
7a=35

Finally, divide by 7 on both sides:
7/7=1 and 35/7=5

your answer will be
a=5

Answer 2

7a+21=56

Subtract 21 from 56

7a=35

Divide 35 by 7

Answer a=5