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2.9x+12.72=27.8
We move all terms to the left:
2.9x+12.72-(27.8)=0
We add all the numbers together, and all the variables
2.9x-15.08=0
We move all terms containing x to the left, all other terms to the right
2.9x=15.08
x=15.08/2.9
x=5+0.58/2.9
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