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x-0.2x=2.31
We move all terms to the left:
x-0.2x-(2.31)=0
We add all the numbers together, and all the variables
0.8x-2.31=0
We move all terms containing x to the left, all other terms to the right
0.8x=2.31
x=2.31/0.8
x=2+0.71/0.8
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