Question

`53 + 4 xx c = 21`. What is `c`?

Answer 1

`c = -8`

Explanation:

`53 + 4 xx c = 21` is the same as `53 + 4c = 21.`

(You cannot add 53 and 4 because of the order of operations)

Subtract `53` from each side:

`cancel53+4c-cancel53=21-53`

`4c= -32`

Divide each side by `4` to get

`(4c)/4=-32/4`

`c = -8`

Answer 2

`c=-8`

Explanation:

`53+4*c = 21`

`4c=21-53`

`4c = -32`

`c= -32/4`

`c = -8`

`c= -8`

:)

Answer 3

`c =-8`

Explanation:

Notice that there are two terms on the left side.

`color(blue)(53) + color(red)(4xxc) = 21`

Simplifying gives:`" "color(blue)(53) + color(red)(4c) = 21`
(Remember to multiply first)

`color(blue)(53) and color(red)(4c)` are unlike terms and cannot be added.

To solve the equation:
isolate `color(red)(4c)` by subtracting `53` on both sides.

`53+4c-53 = 21-53`

`4c = -32`

`c =-8`