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12x-86=145+x
We move all terms to the left:
12x-86-(145+x)=0
We add all the numbers together, and all the variables
12x-(x+145)-86=0
We get rid of parentheses
12x-x-145-86=0
We add all the numbers together, and all the variables
11x-231=0
We move all terms containing x to the left, all other terms to the right
11x=231
x=231/11
x=21
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