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3x+7=10x+2x
We move all terms to the left:
3x+7-(10x+2x)=0
We add all the numbers together, and all the variables
3x-(+12x)+7=0
We get rid of parentheses
3x-12x+7=0
We add all the numbers together, and all the variables
-9x+7=0
We move all terms containing x to the left, all other terms to the right
-9x=-7
x=-7/-9
x=7/9
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