5-2a+7a=20

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Solution for 5-2a+7a=20 equation: 



5-2a+7a=20

We move all terms to the left:

5-2a+7a-(20)=0

We add all the numbers together, and all the variables

5a-15=0

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

5a=15

a=15/5

a=3

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