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2=10x-21
We move all terms to the left:
2-(10x-21)=0
We get rid of parentheses
-10x+21+2=0
We add all the numbers together, and all the variables
-10x+23=0
We move all terms containing x to the left, all other terms to the right
-10x=-23
x=-23/-10
x=2+3/10
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