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