-x=x+18

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Solution for -x=x+18 equation:



-x=x+18
We move all terms to the left:
-x-(x+18)=0
We add all the numbers together, and all the variables
-1x-(x+18)=0
We get rid of parentheses
-1x-x-18=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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