8x+21=-3-4x

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Solution for 8x+21=-3-4x equation: 



8x+21=-3-4x

We move all terms to the left:

8x+21-(-3-4x)=0

We add all the numbers together, and all the variables

8x-(-4x-3)+21=0

We get rid of parentheses

8x+4x+3+21=0

We add all the numbers together, and all the variables

12x+24=0

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

12x=-24

x=-24/12

x=-2

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