2(10r-1)=-9

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Solution for 2(10r-1)=-9 equation: 



2(10r-1)=-9

We move all terms to the left:

2(10r-1)-(-9)=0

We add all the numbers together, and all the variables

2(10r-1)+9=0

We multiply parentheses

20r-2+9=0

We add all the numbers together, and all the variables

20r+7=0

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

20r=-7

r=-7/20

r=-7/20

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