-4-9r=77

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Solution for -4-9r=77 equation: 



-4-9r=77

We move all terms to the left:

-4-9r-(77)=0

We add all the numbers together, and all the variables

-9r-81=0

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

-9r=81

r=81/-9

r=-9

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