-900=-9(-4+8x)

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Solution for -900=-9(-4+8x) equation: 



-900=-9(-4+8x)

We move all terms to the left:

-900-(-9(-4+8x))=0

We add all the numbers together, and all the variables

-(-9(8x-4))-900=0



We calculate terms in parentheses: -(-9(8x-4)), so:

-9(8x-4)

We multiply parentheses

-72x+36

Back to the equation:

-(-72x+36)



We get rid of parentheses

72x-36-900=0

We add all the numbers together, and all the variables

72x-936=0

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

72x=936

x=936/72

x=13

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