21x+12=-18-9x

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Solution for 21x+12=-18-9x equation: 



21x+12=-18-9x

We move all terms to the left:

21x+12-(-18-9x)=0

We add all the numbers together, and all the variables

21x-(-9x-18)+12=0

We get rid of parentheses

21x+9x+18+12=0

We add all the numbers together, and all the variables

30x+30=0

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

30x=-30

x=-30/30

x=-1

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