-54=-9(r+81)

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Solution for -54=-9(r+81) equation:



-54=-9(r+81)
We move all terms to the left:
-54-(-9(r+81))=0
We calculate terms in parentheses: -(-9(r+81)), so:
-9(r+81)
We multiply parentheses
-9r-729
Back to the equation:
-(-9r-729)
We get rid of parentheses
9r+729-54=0
We add all the numbers together, and all the variables
9r+675=0
We move all terms containing r to the left, all other terms to the right
9r=-675
r=-675/9
r=-75

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