51-x=-21

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Solution for 51-x=-21 equation: 



51-x=-21

We move all terms to the left:

51-x-(-21)=0

We add all the numbers together, and all the variables

-1x+72=0

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

-x=-72

x=-72/-1

x=+72

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