Question

How do you solve `12r - 10r = 20`?

Answer 1

`r=10`

Explanation:

`"collect like terms on the left side of the equation"`

`rArr2r=20`

`"divide both sides by 2"`

`(cancel(2) r)/cancel(2)=20/2`

`rArrr=10`

`color(blue)"As a check"`

`"left side "=(12xx10)-(10xx10)=120-100=20`

`rArrr=10" is the solution"`