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marysya [2.9K]
3 years ago
14

What is 21=6r+5-7r someone please help thank you

Mathematics
2 answers:
vekshin13 years ago
7 0

Step-by-step explanation:

first combine like terms : 6r and -7r = -1r

21=5 -1r

cancellation cancel the same terms on both sides of the equation by inverse operations:

subtract 5 from both sides 21-5= 16 5-5=0

16=-1r

divide both ends of the equation by -1

16÷1 = 16 1÷ -1= 1

16=r

LekaFEV [45]3 years ago
3 0

Answer:

r=-16

Step-by-step explanation:

21=6r+5-7r

1) Combine alike terms on the right side (6r and -7r):

21=-r+5

2) Subtract a 5 from both sides:

16=-r

3) Divide both sides by -1:

r=-16

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