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b) 40 6-4x[3x(30-18:6:3)]; c) 832:8+[40+8x(100:5-72:4)]x10; d) 25+6x[107-100:(8-3)]9x1; e)1+3x[7+8x7-3+3x(5+6)]; f) [55x5-(199-99x2+20x5)+220:10]:4;