-189=-7(10+a)

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Solution for -189=-7(10+a) equation: 



-189=-7(10+a)

We move all terms to the left:

-189-(-7(10+a))=0

We add all the numbers together, and all the variables

-(-7(a+10))-189=0



We calculate terms in parentheses: -(-7(a+10)), so:

-7(a+10)

We multiply parentheses

-7a-70

Back to the equation:

-(-7a-70)



We get rid of parentheses

7a+70-189=0

We add all the numbers together, and all the variables

7a-119=0

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

7a=119

a=119/7

a=17

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