21+4x=57

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Solution for 21+4x=57 equation: 



21+4x=57

We move all terms to the left:

21+4x-(57)=0

We add all the numbers together, and all the variables

4x-36=0

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

4x=36

x=36/4

x=9

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