20a-5a-7a=8

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Solution for 20a-5a-7a=8 equation: 



20a-5a-7a=8

We move all terms to the left:

20a-5a-7a-(8)=0

We add all the numbers together, and all the variables

8a-8=0

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

8a=8

a=8/8

a=1

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