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a/0.5=20/4
We move all terms to the left:
a/0.5-(20/4)=0
We add all the numbers together, and all the variables
a/0.5-5=0
We multiply all the terms by the denominator
a-5*0.5=0
We add all the numbers together, and all the variables
a-2.5=0
We move all terms containing a to the left, all other terms to the right
a=2.5
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