SOLUTION: Please help understand why in the equation (15-a)/3=-9 a=42 ; I get a=-42

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Question 349411: Please help understand why in the equation (15-a)/3=-9 a=42 ; I get a=-42
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
%2815-a%29%2F3+=+-9 First, multiply both sides by 3.
15-a+=+-27 Now subtract 15 from both sides.
-a+=+-42 Finally, multiply both sides by -1 so you a get a positive a.
a+=+42