3(a+5)=a-15

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Solution for 3(a+5)=a-15 equation: 



3(a+5)=a-15

We move all terms to the left:

3(a+5)-(a-15)=0

We multiply parentheses

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

We get rid of parentheses

3a-a+15+15=0

We add all the numbers together, and all the variables

2a+30=0

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

2a=-30

a=-30/2

a=-15

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