x+21+21+x=24

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Solution for x+21+21+x=24 equation: 



x+21+21+x=24

We move all terms to the left:

x+21+21+x-(24)=0

We add all the numbers together, and all the variables

2x+18=0

We move all terms containing x to the left, all other terms to the right

2x=-18

x=-18/2

x=-9

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