78=3(2a+5)-a

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Solution for 78=3(2a+5)-a equation: 



78=3(2a+5)-a

We move all terms to the left:

78-(3(2a+5)-a)=0



We calculate terms in parentheses: -(3(2a+5)-a), so:

3(2a+5)-a

We add all the numbers together, and all the variables

-1a+3(2a+5)

We multiply parentheses

-1a+6a+15

We add all the numbers together, and all the variables

5a+15

Back to the equation:

-(5a+15)



We get rid of parentheses

-5a-15+78=0

We add all the numbers together, and all the variables

-5a+63=0

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

-5a=-63

a=-63/-5

a=12+3/5

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