21-2x-4=-13

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Solution for 21-2x-4=-13 equation: 



21-2x-4=-13

We move all terms to the left:

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

We add all the numbers together, and all the variables

-2x+30=0

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

-2x=-30

x=-30/-2

x=+15

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