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9x+23=4x+42
We move all terms to the left:
9x+23-(4x+42)=0
We get rid of parentheses
9x-4x-42+23=0
We add all the numbers together, and all the variables
5x-19=0
We move all terms containing x to the left, all other terms to the right
5x=19
x=19/5
x=3+4/5
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