3(7+a)=-15

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Solution for 3(7+a)=-15 equation: 



3(7+a)=-15

We move all terms to the left:

3(7+a)-(-15)=0

We add all the numbers together, and all the variables

3(a+7)-(-15)=0

We add all the numbers together, and all the variables

3(a+7)+15=0

We multiply parentheses

3a+21+15=0

We add all the numbers together, and all the variables

3a+36=0

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

3a=-36

a=-36/3

a=-12

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