13+7x=-9x+21

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Solution for 13+7x=-9x+21 equation: 



13+7x=-9x+21

We move all terms to the left:

13+7x-(-9x+21)=0

We get rid of parentheses

7x+9x-21+13=0

We add all the numbers together, and all the variables

16x-8=0

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

16x=8

x=8/16

x=1/2

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