20=4(x-4)-(x-9)

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Solution for 20=4(x-4)-(x-9) equation: 



20=4(x-4)-(x-9)

We move all terms to the left:

20-(4(x-4)-(x-9))=0



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

4(x-4)-(x-9)

We multiply parentheses

4x-(x-9)-16

We get rid of parentheses

4x-x+9-16

We add all the numbers together, and all the variables

3x-7

Back to the equation:

-(3x-7)



We get rid of parentheses

-3x+7+20=0

We add all the numbers together, and all the variables

-3x+27=0

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

-3x=-27

x=-27/-3

x=+9

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