Question

Find the solution for each equation 20=12-a

Answer 1

The equation

`20=12-a`

is solved for a in the following way.

First, we add a to both sides of the equation to get

`20+a=12-a+a`
`\rightarrow20+a=12`

Next, we subtract 20 from both sides:

`20+a-20=12-20`
`\textcolor{#FF7968}{a=-8.}`

which is our answer!