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12x+1=4x+13
We move all terms to the left:
12x+1-(4x+13)=0
We get rid of parentheses
12x-4x-13+1=0
We add all the numbers together, and all the variables
8x-12=0
We move all terms containing x to the left, all other terms to the right
8x=12
x=12/8
x=1+1/2
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