100=-4(5x-5)

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Solution for 100=-4(5x-5) equation: 



100=-4(5x-5)

We move all terms to the left:

100-(-4(5x-5))=0



We calculate terms in parentheses: -(-4(5x-5)), so:

-4(5x-5)

We multiply parentheses

-20x+20

Back to the equation:

-(-20x+20)



We get rid of parentheses

20x-20+100=0

We add all the numbers together, and all the variables

20x+80=0

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

20x=-80

x=-80/20

x=-4

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