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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