Question

How do you solve `5x+7=27`?

Answer 1

`5x+7=27`

`rarr5x=27-7`

`rarr5x=20`

`rarrx=20/5=4`

Answer 2

Subtract `7` from both sides of the equation
then divide both sides by `5` to isolate `x`
giving `x=4`

Explanation:

If
`color(white)("XXX")5x+7 = 27`
then
`color(white)("XXX")5x+7color(red)(-7)=27color(red)(-7)`
which simplifies as
`color(white)("XXX")5x=20`

If
`color(white)("XXX")5x=20`
then
`color(white)("XXX")(5x)color(red)(div5) = 20color(red)(div5)`
which simplifies as
`color(white)("XXX")x=4`