2r+-1=-9

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



2r+-1=-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

2r+8=0

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

2r=-8

r=-8/2

r=-4

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