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21.03=x-12
We move all terms to the left:
21.03-(x-12)=0
We get rid of parentheses
-x+12+21.03=0
We add all the numbers together, and all the variables
-1x+33.03=0
We move all terms containing x to the left, all other terms to the right
-x=-33.03
x=-33.03/-1
x=33+0.030000000000001/1
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