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6r - 6r² = 3/2 (agar sederhana maka di kalikan 2)
12r -12r² = 3
12r² - 12r + 3 = 0
(4r -3) (3r -1) = 0
4r = 3 atau 3r = 1
r = 3/4 r = 1/3
(kedua ruas dikali 2)
(kedua ruas dibagi 3)
atau