20=-4(x-40)

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Solution for 20=-4(x-40) equation: 



20=-4(x-40)

We move all terms to the left:

20-(-4(x-40))=0



We calculate terms in parentheses: -(-4(x-40)), so:

-4(x-40)

We multiply parentheses

-4x+160

Back to the equation:

-(-4x+160)



We get rid of parentheses

4x-160+20=0

We add all the numbers together, and all the variables

4x-140=0

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

4x=140

x=140/4

x=35

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