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11x+9=2x+15=7x+16
We move all terms to the left:
11x+9-(2x+15)=0
We get rid of parentheses
11x-2x-15+9=0
We add all the numbers together, and all the variables
9x-6=0
We move all terms containing x to the left, all other terms to the right
9x=6
x=6/9
x=2/3
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