8a-7a-a+4a=20

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Solution for 8a-7a-a+4a=20 equation:



8a-7a-a+4a=20
We move all terms to the left:
8a-7a-a+4a-(20)=0
We add all the numbers together, and all the variables
4a-20=0
We move all terms containing a to the left, all other terms to the right
4a=20
a=20/4
a=5

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