-1+-2n=-9

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Solution for -1+-2n=-9 equation: 



-1+-2n=-9

We move all terms to the left:

-1+-2n-(-9)=0

We add all the numbers together, and all the variables

-2n+8=0

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

-2n=-8

n=-8/-2

n=+4

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