3x+12=-6-15

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Solution for 3x+12=-6-15 equation: 



3x+12=-6-15

We move all terms to the left:

3x+12-(-6-15)=0

We add all the numbers together, and all the variables

3x+12-(-21)=0

We add all the numbers together, and all the variables

3x+33=0

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

3x=-33

x=-33/3

x=-11

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