1x+13=-1x+31

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Solution for 1x+13=-1x+31 equation: 



1x+13=-1x+31

We move all terms to the left:

1x+13-(-1x+31)=0

We add all the numbers together, and all the variables

x-(-1x+31)+13=0

We get rid of parentheses

x+1x-31+13=0

We add all the numbers together, and all the variables

2x-18=0

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

2x=18

x=18/2

x=9

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