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2.5x-6.8=12.9
We move all terms to the left:
2.5x-6.8-(12.9)=0
We add all the numbers together, and all the variables
2.5x-19.7=0
We move all terms containing x to the left, all other terms to the right
2.5x=19.7
x=19.7/2.5
x=7+1/1.13636363636
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