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(6 - b)/sin 30⁰ = b/sin 60⁰
(6 - b)/(1/2) = b/(1/2)√3
√3 (6 - b) = b
6√3 - b√3 = b
b(1 + √3) = 6√3
b = 6√3 /(1 + √3) * (1 - √3)/(1 - √3)
= 6√3(1 - √3)/-2
= -3√3 (1 - √3)