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7+2x=12x-7x
We move all terms to the left:
7+2x-(12x-7x)=0
We add all the numbers together, and all the variables
2x-(+5x)+7=0
We get rid of parentheses
2x-5x+7=0
We add all the numbers together, and all the variables
-3x+7=0
We move all terms containing x to the left, all other terms to the right
-3x=-7
x=-7/-3
x=2+1/3
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