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12.6=x+7.1
We move all terms to the left:
12.6-(x+7.1)=0
We get rid of parentheses
-x-7.1+12.6=0
We add all the numbers together, and all the variables
-1x+5.5=0
We move all terms containing x to the left, all other terms to the right
-x=-5.5
x=-5.5/-1
x=5+0.5/1
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