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2x+3x=21+8x
We move all terms to the left:
2x+3x-(21+8x)=0
We add all the numbers together, and all the variables
2x+3x-(8x+21)=0
We add all the numbers together, and all the variables
5x-(8x+21)=0
We get rid of parentheses
5x-8x-21=0
We add all the numbers together, and all the variables
-3x-21=0
We move all terms containing x to the left, all other terms to the right
-3x=21
x=21/-3
x=-7
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