5(a-1)=3a+15

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Solution for 5(a-1)=3a+15 equation: 



5(a-1)=3a+15

We move all terms to the left:

5(a-1)-(3a+15)=0

We multiply parentheses

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

We get rid of parentheses

5a-3a-15-5=0

We add all the numbers together, and all the variables

2a-20=0

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

2a=20

a=20/2

a=10

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