You find a common denominator, for example, if you want to subtract 3/4 minus 1/2 you would have to multiply 1/2 by 2/2, which equals 2/4, then you can do 3/4-2/4, which is 1/4. Sorry if it’s a bit confusing, hope it helps!
Answer:
A. 
Step-by-step explanation:
I could not make clarifications of what you are asking, but this is similar to 
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B.) (1,1) (2,5) should be your answer.
Answer: 4
Step by step explanation
-9-f-7=-7f+8
7f-f=9+8+7
6f=24
f=24/6
f=4
Step-by-step explanation:
Answer: 3x-7
Explanation: x times 3
(3x)
subtracted by 7
(3x-7)
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