42-15, (5+3) : (3+5-4), (52+2) : 9, 7x3-4x4, (4+6x6) : 23, [3x(5-1)]:2, 20:2-6:2, 3x5-[3x(4-2)+1], 21:3+[10:(7-2)], 3+4+5+6-2x4, (9x4+8):4, 6x4:2, 42-[9:(8-5)], -14+7x4, [(-3)-(-8)]x3, 24+(50-1), 4x3+22+1, [(-5)-(-9)]x4+2, 20:4+20:4+20:4+4, 16:4x[(7x2+1):3], (9-6)x[(-2)-(-9)], 2+5x4, 7x3+8:4, (12-3-3)x12:3, 8x3+(42-3x5), (7+6)x2, 33+ 18-6x3, 7x(3+8:4-1), (15:3+12:4)x4-3, (4-1)x(7+3), [18:(7+2)]x10+11, 24+24.

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