14 - 12+2=,  12 - 14-2=, 14.55 - 12.5+2.05=, 30.1 - 9.1+21=, 10 - 8+2=, 5a+6b - 2a+2b+a+3b+2a+b, 35 - 5X7, 109 - 10.9X10, 208 - 104X2, 2a+8b - a+4b+a+2b+2b,

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