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x+0.2*x=231
We move all terms to the left:
x+0.2*x-(231)=0
We add all the numbers together, and all the variables
1.2x-231=0
We move all terms containing x to the left, all other terms to the right
1.2x=231
x=231/1.2
x=192+0.60000000000002/1.2
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