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2.5x+6.1=12.5
We move all terms to the left:
2.5x+6.1-(12.5)=0
We add all the numbers together, and all the variables
2.5x-6.4=0
We move all terms containing x to the left, all other terms to the right
2.5x=6.4
x=6.4/2.5
x=2+1/1.7857142857143
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