20a+2a-2a-20a+a=13

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Solution for 20a+2a-2a-20a+a=13 equation: 



20a+2a-2a-20a+a=13

We move all terms to the left:

20a+2a-2a-20a+a-(13)=0

We add all the numbers together, and all the variables

a-13=0

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

a=13

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