5+7=18-x

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Solution for 5+7=18-x equation: 



5+7=18-x

We move all terms to the left:

5+7-(18-x)=0

We add all the numbers together, and all the variables

-(-1x+18)+5+7=0

We add all the numbers together, and all the variables

-(-1x+18)+12=0

We get rid of parentheses

1x-18+12=0

We add all the numbers together, and all the variables

x-6=0

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

x=6

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