12x+13=-9x+20

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Solution for 12x+13=-9x+20 equation: 



12x+13=-9x+20

We move all terms to the left:

12x+13-(-9x+20)=0

We get rid of parentheses

12x+9x-20+13=0

We add all the numbers together, and all the variables

21x-7=0

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

21x=7

x=7/21

x=1/3

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