10a+3a=20

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Solution for 10a+3a=20 equation: 



10a+3a=20

We move all terms to the left:

10a+3a-(20)=0

We add all the numbers together, and all the variables

13a-20=0

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

13a=20

a=20/13

a=1+7/13

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