3x+7=2x+21.

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Solution for 3x+7=2x+21. equation: 



3x+7=2x+21.

We move all terms to the left:

3x+7-(2x+21.)=0

We add all the numbers together, and all the variables

3x-(2x+21)+7=0

We get rid of parentheses

3x-2x-21+7=0

We add all the numbers together, and all the variables

x-14=0

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

x=14

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