8x-4x+9=-21

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Solution for 8x-4x+9=-21 equation: 



8x-4x+9=-21

We move all terms to the left:

8x-4x+9-(-21)=0

We add all the numbers together, and all the variables

4x+30=0

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

4x=-30

x=-30/4

x=-7+1/2

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