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0*9*7*2*6 = 9*6*7*2*0
9 is one possible expression.
The expression is -9 + 13 + 12
False. Consider the expression 10 - 9 - 8 and let the brackets denote the operation to be performed next (if there are more than one). Then 10 - (9 - 8) = 10 - 1 = 9 While (10 - 9) - 8 = 1 - 8 = - 7
9 + a