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x+x+2.40=8.20
We move all terms to the left:
x+x+2.40-(8.20)=0
We add all the numbers together, and all the variables
x+x+2.40-(8.2)=0
We add all the numbers together, and all the variables
2x-5.8=0
We move all terms containing x to the left, all other terms to the right
2x=5.8
x=5.8/2
x=2+1/1.1111111111111
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