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4+2.1x=22.1
We move all terms to the left:
4+2.1x-(22.1)=0
We add all the numbers together, and all the variables
2.1x-18.1=0
We move all terms containing x to the left, all other terms to the right
2.1x=18.1
x=18.1/2.1
x=8+1/1.6153846153846
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