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6.9x-11.5=2.3
We move all terms to the left:
6.9x-11.5-(2.3)=0
We add all the numbers together, and all the variables
6.9x-13.8=0
We move all terms containing x to the left, all other terms to the right
6.9x=13.8
x=13.8/6.9
x=2
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