3(2x+9)=-6+21

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Solution for 3(2x+9)=-6+21 equation: 



3(2x+9)=-6+21

We move all terms to the left:

3(2x+9)-(-6+21)=0

We add all the numbers together, and all the variables

3(2x+9)-15=0

We multiply parentheses

6x+27-15=0

We add all the numbers together, and all the variables

6x+12=0

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

6x=-12

x=-12/6

x=-2

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