20x+40=640

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Solution for 20x+40=640 equation: 



20x+40=640

We move all terms to the left:

20x+40-(640)=0

We add all the numbers together, and all the variables

20x-600=0

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

20x=600

x=600/20

x=30

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