-1+9=2a

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Solution for -1+9=2a equation: 



-1+9=2a

We move all terms to the left:

-1+9-(2a)=0

We add all the numbers together, and all the variables

-2a+8=0

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

-2a=-8

a=-8/-2

a=+4

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