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

##### 1 Answer

Jul 15, 2017

#### 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"#