5(a+6)=15

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Solution for 5(a+6)=15 equation: 



5(a+6)=15

We move all terms to the left:

5(a+6)-(15)=0

We multiply parentheses

5a+30-15=0

We add all the numbers together, and all the variables

5a+15=0

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

5a=-15

a=-15/5

a=-3

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