7a+2a+2a-a=10

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Solution for 7a+2a+2a-a=10 equation: 



7a+2a+2a-a=10

We move all terms to the left:

7a+2a+2a-a-(10)=0

We add all the numbers together, and all the variables

10a-10=0

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

10a=10

a=10/10

a=1

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