2(-2x+4)=20

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Solution for 2(-2x+4)=20 equation: 



2(-2x+4)=20

We move all terms to the left:

2(-2x+4)-(20)=0

We multiply parentheses

-4x+8-20=0

We add all the numbers together, and all the variables

-4x-12=0

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

-4x=12

x=12/-4

x=-3

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