-4x-12+6x-21=6

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Solution for -4x-12+6x-21=6 equation: 



-4x-12+6x-21=6

We move all terms to the left:

-4x-12+6x-21-(6)=0

We add all the numbers together, and all the variables

2x-39=0

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

2x=39

x=39/2

x=19+1/2

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