20a-16a=4

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Solution for 20a-16a=4 equation: 



20a-16a=4

We move all terms to the left:

20a-16a-(4)=0

We add all the numbers together, and all the variables

4a-4=0

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

4a=4

a=4/4

a=1

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