SOLUTION: I am having a hard time with the following equation: 7+4(2a+15)=-13 11(2a+15)=-13

Algebra ->  Expressions-with-variables -> SOLUTION: I am having a hard time with the following equation: 7+4(2a+15)=-13 11(2a+15)=-13       Log On


   

Question 508915: I am having a hard time with the following equation: 7+4(2a+15)=-13
11(2a+15)=-13
22a+165=-13
22a=-178
8 and 1/11
However, the text disagrees with me. (My moneys on the text book.)
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
7%2Bhighlight%284%282a%2B15%29%29+=+-13 First apply the "distributive property" to the term in the red box:
highlight%284%282a%2B15%29%29+=+%284%2A2a%2B4%2A15%29=highlight%288a%2B60%29 so now you have:
7%2Bhighlight%28%288a%2B60%29%29+=+-13 Now simplify the left side of the equation.
67%2B8a+=+-13 Subtract 67 from both sides.
8a+=+-80 Finally, divide both sides by 8.
highlight_green%28a+=+-10%29