1-x-7=12

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Solution for 1-x-7=12 equation: 



1-x-7=12

We move all terms to the left:

1-x-7-(12)=0

We add all the numbers together, and all the variables

-1x-18=0

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

-x=18

x=18/-1

x=-18

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