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7-5a=3-a
We move all terms to the left:
7-5a-(3-a)=0
We add all the numbers together, and all the variables
-5a-(-1a+3)+7=0
We get rid of parentheses
-5a+1a-3+7=0
We add all the numbers together, and all the variables
-4a+4=0
We move all terms containing a to the left, all other terms to the right
-4a=-4
a=-4/-4
a=1
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