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3x+7+3x+3x=3x+3x+4x+9
We move all terms to the left:
3x+7+3x+3x-(3x+3x+4x+9)=0
We add all the numbers together, and all the variables
3x+3x+3x-(10x+9)+7=0
We add all the numbers together, and all the variables
9x-(10x+9)+7=0
We get rid of parentheses
9x-10x-9+7=0
We add all the numbers together, and all the variables
-1x-2=0
We move all terms containing x to the left, all other terms to the right
-x=2
x=2/-1
x=-2
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