3x+21+x+57=90

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Solution for 3x+21+x+57=90 equation: 



3x+21+x+57=90

We move all terms to the left:

3x+21+x+57-(90)=0

We add all the numbers together, and all the variables

4x-12=0

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

4x=12

x=12/4

x=3

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