13x+7=6x=21

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Solution for 13x+7=6x=21 equation: 



13x+7=6x=21

We move all terms to the left:

13x+7-(6x)=0

We add all the numbers together, and all the variables

7x+7=0

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

7x=-7

x=-7/7

x=-1

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