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3x+9.6=3.21
We move all terms to the left:
3x+9.6-(3.21)=0
We add all the numbers together, and all the variables
3x+6.39=0
We move all terms containing x to the left, all other terms to the right
3x=-6.39
x=-6.39/3
x=-2+0.39/3
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