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23=-2A+4
We move all terms to the left:
23-(-2A+4)=0
We get rid of parentheses
2A-4+23=0
We add all the numbers together, and all the variables
2A+19=0
We move all terms containing A to the left, all other terms to the right
2A=-19
A=-19/2
A=-9+1/2
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