20a+15=18a+21

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Solution for 20a+15=18a+21 equation: 



20a+15=18a+21

We move all terms to the left:

20a+15-(18a+21)=0

We get rid of parentheses

20a-18a-21+15=0

We add all the numbers together, and all the variables

2a-6=0

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

2a=6

a=6/2

a=3

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