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3x+7=9x+14
We move all terms to the left:
3x+7-(9x+14)=0
We get rid of parentheses
3x-9x-14+7=0
We add all the numbers together, and all the variables
-6x-7=0
We move all terms containing x to the left, all other terms to the right
-6x=7
x=7/-6
x=-1+1/6
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