-15-30-x=-66

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Solution for -15-30-x=-66 equation: 



-15-30-x=-66

We move all terms to the left:

-15-30-x-(-66)=0

We add all the numbers together, and all the variables

-1x+21=0

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

-x=-21

x=-21/-1

x=+21

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