2(r+1)-9=7

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Solution for 2(r+1)-9=7 equation: 



2(r+1)-9=7

We move all terms to the left:

2(r+1)-9-(7)=0

We add all the numbers together, and all the variables

2(r+1)-16=0

We multiply parentheses

2r+2-16=0

We add all the numbers together, and all the variables

2r-14=0

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

2r=14

r=14/2

r=7

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