a+2a+3a+4a=20

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Solution for a+2a+3a+4a=20 equation: 



a+2a+3a+4a=20

We move all terms to the left:

a+2a+3a+4a-(20)=0

We add all the numbers together, and all the variables

10a-20=0

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

10a=20

a=20/10

a=2

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