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x/5=2.1
We move all terms to the left:
x/5-(2.1)=0
We add all the numbers together, and all the variables
x/5-2.1=0
We multiply all the terms by the denominator
x-(2.1)*5=0
We add all the numbers together, and all the variables
x-10.5=0
We move all terms containing x to the left, all other terms to the right
x=10.5
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