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5.1=-3x+9.9
We move all terms to the left:
5.1-(-3x+9.9)=0
We get rid of parentheses
3x-9.9+5.1=0
We add all the numbers together, and all the variables
3x-4.8=0
We move all terms containing x to the left, all other terms to the right
3x=4.8
x=4.8/3
x=1+1/1.6666666666667
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