-640=-20(g+45)

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Solution for -640=-20(g+45) equation: 



-640=-20(g+45)

We move all terms to the left:

-640-(-20(g+45))=0



We calculate terms in parentheses: -(-20(g+45)), so:

-20(g+45)

We multiply parentheses

-20g-900

Back to the equation:

-(-20g-900)



We get rid of parentheses

20g+900-640=0

We add all the numbers together, and all the variables

20g+260=0

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

20g=-260

g=-260/20

g=-13

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