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12.9=x7.1.
We move all terms to the left:
12.9-(x7.1.)=0
We add all the numbers together, and all the variables
-(+x7.1.)+12.9=0
We get rid of parentheses
-x7.1.+12.9=0
We move all terms containing x to the left, all other terms to the right
-x7.1.=-12.9
x=-12.9/1
x=-12.9
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