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6x+9=-3x-21-3
We move all terms to the left:
6x+9-(-3x-21-3)=0
We add all the numbers together, and all the variables
6x-(-3x-24)+9=0
We get rid of parentheses
6x+3x+24+9=0
We add all the numbers together, and all the variables
9x+33=0
We move all terms containing x to the left, all other terms to the right
9x=-33
x=-33/9
x=-3+2/3
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