-15-x=-21

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Solution for -15-x=-21 equation: 



-15-x=-21

We move all terms to the left:

-15-x-(-21)=0

We add all the numbers together, and all the variables

-1x+6=0

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

-x=-6

x=-6/-1

x=+6

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