Question

1/2s=4s-21 I don't understand

Answer 1

`(1)/(2) s` = 4s - 21

First, simplify
`(1)/(2) s` to
`(s)/(2)` / Your problem should look like:
`(s)/(2) = 4s - 21`
Second, multiply both sides by 2. / Your problem should look like:
`s = 8s - 42`
Third, subtract 8s from both sides. / Your problem should look like:
`s - 8s = -42`
Fourth, simplify s - 8s to -7s. / Your problem should look like:
`-7s = -42`
Fifth, divide both sides by -7. / Your problem should look like:
`s = (-42)/(-7)`
Sixth, simplify
`(42)/(-7)` to
`- (42)/(7)` / Your problem should look like:
`s = (42)/(7)`
Seventh, simplify
`(42)/(7)` to 6. / Your problem should look like:
`s = 6`

Answer: s = 6