BO = 2 * GR
x+3 = 2 (3x-1)
x + 3 = 6x - 2
6x - x = 3+2
5x = 5
x = 1
so GR = 3x - 1 = 3(1) - 1 = 3 - 1 = 2
answer: GR = 2
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