x-2(x+5)=20

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Solution for x-2(x+5)=20 equation: 



x-2(x+5)=20

We move all terms to the left:

x-2(x+5)-(20)=0

We multiply parentheses

x-2x-10-20=0

We add all the numbers together, and all the variables

-1x-30=0

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

-x=30

x=30/-1

x=-30

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