-10=-10(a-1)

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Solution for -10=-10(a-1) equation: 



-10=-10(a-1)

We move all terms to the left:

-10-(-10(a-1))=0



We calculate terms in parentheses: -(-10(a-1)), so:

-10(a-1)

We multiply parentheses

-10a+10

Back to the equation:

-(-10a+10)



We get rid of parentheses

10a-10-10=0

We add all the numbers together, and all the variables

10a-20=0

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

10a=20

a=20/10

a=2

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