15=10a+5(a-3)

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Solution for 15=10a+5(a-3) equation: 



15=10a+5(a-3)

We move all terms to the left:

15-(10a+5(a-3))=0



We calculate terms in parentheses: -(10a+5(a-3)), so:

10a+5(a-3)

We multiply parentheses

10a+5a-15

We add all the numbers together, and all the variables

15a-15

Back to the equation:

-(15a-15)



We get rid of parentheses

-15a+15+15=0

We add all the numbers together, and all the variables

-15a+30=0

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

-15a=-30

a=-30/-15

a=+2

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