5(3+a)=30

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Solution for 5(3+a)=30 equation: 



5(3+a)=30

We move all terms to the left:

5(3+a)-(30)=0

We add all the numbers together, and all the variables

5(a+3)-30=0

We multiply parentheses

5a+15-30=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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