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642=x-23.56
We move all terms to the left:
642-(x-23.56)=0
We get rid of parentheses
-x+23.56+642=0
We add all the numbers together, and all the variables
-1x+665.56=0
We move all terms containing x to the left, all other terms to the right
-x=-665.56
x=-665.56/-1
x=665+0.55999999999995/1
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