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6.1x+3.5=58.4
We move all terms to the left:
6.1x+3.5-(58.4)=0
We add all the numbers together, and all the variables
6.1x-54.9=0
We move all terms containing x to the left, all other terms to the right
6.1x=54.9
x=54.9/6.1
x=9
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