3a-3a+3a+4a-5a=20

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Solution for 3a-3a+3a+4a-5a=20 equation: 



3a-3a+3a+4a-5a=20

We move all terms to the left:

3a-3a+3a+4a-5a-(20)=0

We add all the numbers together, and all the variables

2a-20=0

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

2a=20

a=20/2

a=10

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