-2x-(-4x+21)=13

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Solution for -2x-(-4x+21)=13 equation: 



-2x-(-4x+21)=13

We move all terms to the left:

-2x-(-4x+21)-(13)=0

We get rid of parentheses

-2x+4x-21-13=0

We add all the numbers together, and all the variables

2x-34=0

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

2x=34

x=34/2

x=17

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