21=6r+5-7r

please solve 21=6r+5-7r
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Problem: 21=6r+5-7r
please solve 21=6r+5-7r

6r + 5 - 7r = 21
-r + 5 = 21
-r + 5 - 5 = 21 - 5
-r = 16
-r * -1 = 16 * -1
r = -16

Always check the answer.

6r + 5 - 7r = 21
6(-16) + 5 - 7(-16) = 21
-96 + 5 + 112 = 21
21 = 21

Answer: r = -16

 

by Level 11 User (78.4k points)

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