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0.2x+0.5=0.8x-3.1
We move all terms to the left:
0.2x+0.5-(0.8x-3.1)=0
We get rid of parentheses
0.2x-0.8x+3.1+0.5=0
We add all the numbers together, and all the variables
-0.6x+3.6=0
We move all terms containing x to the left, all other terms to the right
-0.6x=-3.6
x=-3.6/-0.6
x=6+4.4408920985006E-16/0.6
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