7(a-8)+21=5(a-5)

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Solution for 7(a-8)+21=5(a-5) equation: 



7(a-8)+21=5(a-5)

We move all terms to the left:

7(a-8)+21-(5(a-5))=0

We multiply parentheses

7a-(5(a-5))-56+21=0



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

5(a-5)

We multiply parentheses

5a-25

Back to the equation:

-(5a-25)



We add all the numbers together, and all the variables

7a-(5a-25)-35=0

We get rid of parentheses

7a-5a+25-35=0

We add all the numbers together, and all the variables

2a-10=0

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

2a=10

a=10/2

a=5

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