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x/7=0.4
We move all terms to the left:
x/7-(0.4)=0
We add all the numbers together, and all the variables
x/7-0.4=0
We multiply all the terms by the denominator
x-(0.4)*7=0
We add all the numbers together, and all the variables
x-2.8=0
We move all terms containing x to the left, all other terms to the right
x=2.8
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