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12.8=x-18.8
We move all terms to the left:
12.8-(x-18.8)=0
We get rid of parentheses
-x+18.8+12.8=0
We add all the numbers together, and all the variables
-1x+31.6=0
We move all terms containing x to the left, all other terms to the right
-x=-31.6
x=-31.6/-1
x=31+0.6/1
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