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d - 10 : 1 - 10 = 3 - (-2) : 1 -(-2)
d - 10 : -9 = 5 : 3
3 ( d - 10) = -9 ( 5)
3d - 30 = -45
3d = -45 + 30
3d = -15
d = -15 : 3
d = -5