25=3(a-15)-a

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Solution for 25=3(a-15)-a equation: 



25=3(a-15)-a

We move all terms to the left:

25-(3(a-15)-a)=0



We calculate terms in parentheses: -(3(a-15)-a), so:

3(a-15)-a

We add all the numbers together, and all the variables

-1a+3(a-15)

We multiply parentheses

-1a+3a-45

We add all the numbers together, and all the variables

2a-45

Back to the equation:

-(2a-45)



We get rid of parentheses

-2a+45+25=0

We add all the numbers together, and all the variables

-2a+70=0

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

-2a=-70

a=-70/-2

a=+35

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