5x+21=3x+39

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Solution for 5x+21=3x+39 equation: 



5x+21=3x+39

We move all terms to the left:

5x+21-(3x+39)=0

We get rid of parentheses

5x-3x-39+21=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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