2x+4=3x+21

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Solution for 2x+4=3x+21 equation: 



2x+4=3x+21

We move all terms to the left:

2x+4-(3x+21)=0

We get rid of parentheses

2x-3x-21+4=0

We add all the numbers together, and all the variables

-1x-17=0

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

-x=17

x=17/-1

x=-17

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