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23x-7=4x+12
We move all terms to the left:
23x-7-(4x+12)=0
We get rid of parentheses
23x-4x-12-7=0
We add all the numbers together, and all the variables
19x-19=0
We move all terms containing x to the left, all other terms to the right
19x=19
x=19/19
x=1
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