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0.91x=2.1
We move all terms to the left:
0.91x-(2.1)=0
We add all the numbers together, and all the variables
0.91x-2.1=0
We move all terms containing x to the left, all other terms to the right
0.91x=2.1
x=2.1/0.91
x=2+0.28/0.91
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