72=3x+21

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Solution for 72=3x+21 equation: 



72=3x+21

We move all terms to the left:

72-(3x+21)=0

We get rid of parentheses

-3x-21+72=0

We add all the numbers together, and all the variables

-3x+51=0

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

-3x=-51

x=-51/-3

x=+17

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