Question 25161
For additional help with equation solving, see my Lesson Plan in algebra.com for Equation Solving.  


9(2x+8)=20-(x+5)
18x + 72 = 20 - x - 5
18x + 72 = 15 - x


Add +x to each side:
18x + 72 + x = 15 -x + x
19x + 72 = 15


Subtract 72 from each side:
19x + 72 - 72 = 15 - 72
19x = - 57


Divide both sides by 19, and believe it or not, IT COMES OUT NICELY!!

{{{(19x)/19= -57/19}}}
{{{x= -3}}}


After this good fortune, how about checking it?

9(2x+8)=20-(x+5)
9(-6+8)= 20 -(-3+5)
9(2) = 20 - 2
18=18
It checks!!


R^2 at SCC