Question

How do you solve `7g + 2g = 18`?

Answer 1

`g=2`

Explanation:

Combine like terms on the left side:

`color(blue)(7g+2g)=18`

`9g=18`

Divide `9` from both sides to solve for `g`

`cancel(9g)/cancelcolor(red)(9)=18/color(red)9`

`g=2`

Answer 2

On the LHS, both are variables, so they can be added easily( it is like adding a number)
`9g=18`
Now, the 9 on the LHS will go to the RHS as `18/9` because on the LHS it is in multiplication`(9 xx g)` so on RHS it will inverse,
`g=18/9`
`g=2`