4a-2a=20.5

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Solution for 4a-2a=20.5 equation: 



4a-2a=20.5

We move all terms to the left:

4a-2a-(20.5)=0

We add all the numbers together, and all the variables

2a-20.5=0

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

2a=20.5

a=20.5/2

a=10+0.5/2

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