Question

How do you solve `9x+12 = 4x+7`?

Answer 1

`x=-1`

Explanation:

`9x+12=4x+7`

Subtract both sides by `4x`

`rarr9x+12-4x=4x+7-4x`

`rarr5x+12=7`

`rarr5x=7-12`

`rarr5x=-5`

`rArrx=-5/5=-1`

Verify

`9(-1)+12=4(-1)+7`

`-9+12=-4+7`

`3=3`

`:.x=-1`