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3x+11=-9x
We move all terms to the left:
3x+11-(-9x)=0
We get rid of parentheses
3x+9x+11=0
We add all the numbers together, and all the variables
12x+11=0
We move all terms containing x to the left, all other terms to the right
12x=-11
x=-11/12
x=-11/12
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