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7a-5a+2=a-a
We move all terms to the left:
7a-5a+2-(a-a)=0
We add all the numbers together, and all the variables
7a-5a+2-0=0
We add all the numbers together, and all the variables
2a+2=0
We move all terms containing a to the left, all other terms to the right
2a=-2
a=-2/2
a=-1
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