(15+7) - x =13, x=9, x=10, x=40, x=30, (12+8+4) - x = 14, x=22, x=9, x=30, x=10, x - (9+7) = 24, x=30, x=40, x=10, x=9, x - (4+3) = 15, x=9, x=40, x=10, x=22, (35+15) - x = 20, x=40, x=9, x=22, x=30.

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