-4x-21=7x+12

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Solution for -4x-21=7x+12 equation: 



-4x-21=7x+12

We move all terms to the left:

-4x-21-(7x+12)=0

We get rid of parentheses

-4x-7x-12-21=0

We add all the numbers together, and all the variables

-11x-33=0

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

-11x=33

x=33/-11

x=-3

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