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531.56+x/20=558.56
We move all terms to the left:
531.56+x/20-(558.56)=0
We add all the numbers together, and all the variables
x/20-27=0
We multiply all the terms by the denominator
x-27*20=0
We add all the numbers together, and all the variables
x-540=0
We move all terms containing x to the left, all other terms to the right
x=540
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