11a+7a-15=21

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Solution for 11a+7a-15=21 equation: 



11a+7a-15=21

We move all terms to the left:

11a+7a-15-(21)=0

We add all the numbers together, and all the variables

18a-36=0

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

18a=36

a=36/18

a=2

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