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x+x+0.78+x+0.78+0.52=9.91
We move all terms to the left:
x+x+0.78+x+0.78+0.52-(9.91)=0
We add all the numbers together, and all the variables
3x-7.83=0
We move all terms containing x to the left, all other terms to the right
3x=7.83
x=7.83/3
x=2+1/1.6393442623
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