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7x-12.13=6x+12.87
We move all terms to the left:
7x-12.13-(6x+12.87)=0
We get rid of parentheses
7x-6x-12.87-12.13=0
We add all the numbers together, and all the variables
x-25=0
We move all terms containing x to the left, all other terms to the right
x=25
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