18-x+12+x+19-x+12=x+31

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Solution for 18-x+12+x+19-x+12=x+31 equation: 



18-x+12+x+19-x+12=x+31

We move all terms to the left:

18-x+12+x+19-x+12-(x+31)=0

We add all the numbers together, and all the variables

-1x-(x+31)+61=0

We get rid of parentheses

-1x-x-31+61=0

We add all the numbers together, and all the variables

-2x+30=0

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

-2x=-30

x=-30/-2

x=+15

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