# How do you solve #-8x = - 21- 9x#?

##### 2 Answers

Apr 26, 2018

#### Explanation:

#"collect terms in x on the left side of the equation"#

#"and numeric values on the right side"#

#"add 9x to both sides"#

#-8x+9x=-21cancel(-9x)cancel(+9x)#

#rArrx=-21#

#color(blue)"As a check"# Substitute this value into the equation and if both sides are equal then it is the solution.

#"left "=-8xx-21=168#

#"right "=-21+(-9xx-21)=-21+189=168#

#rArrx=-21" is the solution"#

Apr 26, 2018

#### Explanation:

We need to put every expression with