Find r if 3 (r - 7) = 4 (2 - 2r) + 4

Question

Mathematics

Guest

6 July, 00:22

Find r if 3 (r - 7) = 4 (2 - 2r) + 4

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Answers (2)

Know the Answer?

Zaniyah Roberts · Answer 1

Step-by-step explanation:

3 (r - 7) = 4 (2 - 2r) + 4

3r + (-21) = 8 + (-8r) + 4

-21+8+4=3r + (-8r)

-9=-5r

Neil Petty · Answer 2

r=3

Step-by-step explanation:

3 (r - 7) = 4 (2 - 2r) + 4

Distribute

3r - 21 = 8 - 8r + 4

Combine like terms

3r - 21 = 12 - 8r

Add 8r to each side

3r + 8r-21 = 12 - 8r+8r

11r - 21 = 12

Add 21 to each side

11r - 21+21 = 12+21

11r = 33

Divide each side by 11

11r/11 = 33/11

r = 3