2a+8a=-10

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Solution for 2a+8a=-10 equation: 



2a+8a=-10

We move all terms to the left:

2a+8a-(-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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