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2x+21=4x-2
We move all terms to the left:
2x+21-(4x-2)=0
We get rid of parentheses
2x-4x+2+21=0
We add all the numbers together, and all the variables
-2x+23=0
We move all terms containing x to the left, all other terms to the right
-2x=-23
x=-23/-2
x=11+1/2
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