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21x+1=31-9x
We move all terms to the left:
21x+1-(31-9x)=0
We add all the numbers together, and all the variables
21x-(-9x+31)+1=0
We get rid of parentheses
21x+9x-31+1=0
We add all the numbers together, and all the variables
30x-30=0
We move all terms containing x to the left, all other terms to the right
30x=30
x=30/30
x=1
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