13-4x=21

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Solution for 13-4x=21 equation: 



13-4x=21

We move all terms to the left:

13-4x-(21)=0

We add all the numbers together, and all the variables

-4x-8=0

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

-4x=8

x=8/-4

x=-2

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