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3x-0.81x=0.68
We move all terms to the left:
3x-0.81x-(0.68)=0
We add all the numbers together, and all the variables
2.19x-0.68=0
We move all terms containing x to the left, all other terms to the right
2.19x=0.68
x=0.68/2.19
x=0.68/2.19
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