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0.9x+3.1=9.4
We move all terms to the left:
0.9x+3.1-(9.4)=0
We add all the numbers together, and all the variables
0.9x-6.3=0
We move all terms containing x to the left, all other terms to the right
0.9x=6.3
x=6.3/0.9
x=7
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