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12x+8=3x+16
We move all terms to the left:
12x+8-(3x+16)=0
We get rid of parentheses
12x-3x-16+8=0
We add all the numbers together, and all the variables
9x-8=0
We move all terms containing x to the left, all other terms to the right
9x=8
x=8/9
x=8/9
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