78+r=-13.

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Solution for 78+r=-13. equation: 



78+r=-13.

We move all terms to the left:

78+r-(-13.)=0

We add all the numbers together, and all the variables

r+78-(-13)=0

We add all the numbers together, and all the variables

r+91=0

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

r=-91

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