Question

How do you solve `15< 5a + 20`?

Answer 1

`a > -1`

Explanation:

Given
`color(white)("XXX")15 < 5a +20`

Subtract `20` from both sides
`color(white)("XXX")-5 < 5a`

Divide both sides by `5`
`color(white)("XXX")-1 < acolor(white)("xxxx")`or in its more common sequence `a > -1`

Remember you can add or subtract the same amount to both sides of an inequality or multiply or divide both sides of an inequality by any value greater than zero
without changing the direction of the inequality.