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21=6x-4
We move all terms to the left:
21-(6x-4)=0
We get rid of parentheses
-6x+4+21=0
We add all the numbers together, and all the variables
-6x+25=0
We move all terms containing x to the left, all other terms to the right
-6x=-25
x=-25/-6
x=4+1/6
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