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7.7x-12.1=11
We move all terms to the left:
7.7x-12.1-(11)=0
We add all the numbers together, and all the variables
7.7x-23.1=0
We move all terms containing x to the left, all other terms to the right
7.7x=23.1
x=23.1/7.7
x=3
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