How do you evaluate #4- 7a = - 8a + 5a#?

1 Answer
Dec 15, 2016

#a=1#

Explanation:

Ok lets start with the right side of the equation.

#-8a+5a= -3a #

So, our equation is now: #4-7a=-3a#

Next we add #7a# to both sides.

Now, our equation should be: #4=4a#

Finally, we divide both sides by 4.

With this we get #1=a#, which is our answer.

Hope this helps!