3(a+2)+5=-7

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Solution for 3(a+2)+5=-7 equation: 



3(a+2)+5=-7

We move all terms to the left:

3(a+2)+5-(-7)=0

We add all the numbers together, and all the variables

3(a+2)+12=0

We multiply parentheses

3a+6+12=0

We add all the numbers together, and all the variables

3a+18=0

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

3a=-18

a=-18/3

a=-6

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