5x+6=2x+21=54

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Solution for 5x+6=2x+21=54 equation: 



5x+6=2x+21=54

We move all terms to the left:

5x+6-(2x+21)=0

We get rid of parentheses

5x-2x-21+6=0

We add all the numbers together, and all the variables

3x-15=0

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

3x=15

x=15/3

x=5

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