4*(x+20)=100

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Solution for 4*(x+20)=100 equation: 



4*(x+20)=100

We move all terms to the left:

4*(x+20)-(100)=0

We multiply parentheses

4x+80-100=0

We add all the numbers together, and all the variables

4x-20=0

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

4x=20

x=20/4

x=5

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