SOLUTION: add -3/4 + (9/28) please show steps

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Question 371049: add -3/4 + (9/28) please show steps
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
USe a common denominator, 28
%28-3%2F4%29%287%2F7%29=-21%2F28
-3%2F4%2B9%2F28=-21%2F28%2B9%2F28
-3%2F4%2B9%2F28=%28-21%2B9%29%2F28
-3%2F4%2B9%2F28=-12%2F28
-3%2F4%2B9%2F28=highlight%28-3%2F7%29