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2.1x-9.48=6.9
We move all terms to the left:
2.1x-9.48-(6.9)=0
We add all the numbers together, and all the variables
2.1x-16.38=0
We move all terms containing x to the left, all other terms to the right
2.1x=16.38
x=16.38/2.1
x=7+1/1.25
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