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21-2x=4x-3
We move all terms to the left:
21-2x-(4x-3)=0
We get rid of parentheses
-2x-4x+3+21=0
We add all the numbers together, and all the variables
-6x+24=0
We move all terms containing x to the left, all other terms to the right
-6x=-24
x=-24/-6
x=+4
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