21x+12=-51

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Solution for 21x+12=-51 equation: 



21x+12=-51

We move all terms to the left:

21x+12-(-51)=0

We add all the numbers together, and all the variables

21x+63=0

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

21x=-63

x=-63/21

x=-3

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