-7=-2r+1

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Solution for -7=-2r+1 equation: 



-7=-2r+1

We move all terms to the left:

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

We get rid of parentheses

2r-1-7=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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