Question

How do you solve `120- 28a = 78`?

Answer 1

`x=3/2=1.5`

Explanation:

subtract 78 from both sides :
`120-78-28a=78-78 =0`
`42-28a=0`

Add `-42` to both sides :
`42-42-28a=0-42`
`-28a =-42`

divide both sides by -28
`(-28)/-28a=(-42)/-28`

`a=3/2=1.5`