21-r=-87+2

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Solution for 21-r=-87+2 equation: 



21-r=-87+2

We move all terms to the left:

21-r-(-87+2)=0

We add all the numbers together, and all the variables

-r+21-(-85)=0

We add all the numbers together, and all the variables

-1r+106=0

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

-r=-106

r=-106/-1

r=+106

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