5a+21a=100

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Solution for 5a+21a=100 equation: 



5a+21a=100

We move all terms to the left:

5a+21a-(100)=0

We add all the numbers together, and all the variables

26a-100=0

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

26a=100

a=100/26

a=3+11/13

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