20x+40=280

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Solution for 20x+40=280 equation: 



20x+40=280

We move all terms to the left:

20x+40-(280)=0

We add all the numbers together, and all the variables

20x-240=0

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

20x=240

x=240/20

x=12

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