Answer:
r = 1
Explanation:
Given
=
( cross- multiply )
(6r + 1)(2r - 1) = (3r + 4)(4r - 3)
Expand factors on both sides using FOIL
12r² - 4r - 1 = 12r² + 7r - 12 ( subtract 12r² from both sides )
- 4r - 1 = 7r - 12 ( subtract 7r from both sides )
- 11r - 1 = - 12 ( add 1 to both sides )
- 11r = - 11 ( divide both sides by - 11 )
r = 1