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7x+9=-9x-11
We move all terms to the left:
7x+9-(-9x-11)=0
We get rid of parentheses
7x+9x+11+9=0
We add all the numbers together, and all the variables
16x+20=0
We move all terms containing x to the left, all other terms to the right
16x=-20
x=-20/16
x=-1+1/4
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