5x+21=2x+30

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Solution for 5x+21=2x+30 equation: 



5x+21=2x+30

We move all terms to the left:

5x+21-(2x+30)=0

We get rid of parentheses

5x-2x-30+21=0

We add all the numbers together, and all the variables

3x-9=0

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

3x=9

x=9/3

x=3

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