57+3x+12=90

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Solution for 57+3x+12=90 equation: 



57+3x+12=90

We move all terms to the left:

57+3x+12-(90)=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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