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2x+6+2x+6=5x+9
We move all terms to the left:
2x+6+2x+6-(5x+9)=0
We add all the numbers together, and all the variables
4x-(5x+9)+12=0
We get rid of parentheses
4x-5x-9+12=0
We add all the numbers together, and all the variables
-1x+3=0
We move all terms containing x to the left, all other terms to the right
-x=-3
x=-3/-1
x=+3
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