a+2a+3a+4a+5a=300

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Solution for a+2a+3a+4a+5a=300 equation: 



a+2a+3a+4a+5a=300

We move all terms to the left:

a+2a+3a+4a+5a-(300)=0

We add all the numbers together, and all the variables

15a-300=0

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

15a=300

a=300/15

a=20

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