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12.4x+7.7=82.2
We move all terms to the left:
12.4x+7.7-(82.2)=0
We add all the numbers together, and all the variables
12.4x-74.5=0
We move all terms containing x to the left, all other terms to the right
12.4x=74.5
x=74.5/12.4
x=6+0.099999999999994/12.4
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