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12x+1=9x+16
We move all terms to the left:
12x+1-(9x+16)=0
We get rid of parentheses
12x-9x-16+1=0
We add all the numbers together, and all the variables
3x-15=0
We move all terms containing x to the left, all other terms to the right
3x=15
x=15/3
x=5
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