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21-x=5x-3
We move all terms to the left:
21-x-(5x-3)=0
We add all the numbers together, and all the variables
-1x-(5x-3)+21=0
We get rid of parentheses
-1x-5x+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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