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-4=2a-3
We move all terms to the left:
-4-(2a-3)=0
We get rid of parentheses
-2a+3-4=0
We add all the numbers together, and all the variables
-2a-1=0
We move all terms containing a to the left, all other terms to the right
-2a=1
a=1/-2
a=-1/2
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