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What is ##3- ( - 3- 6\times 7)##?
48
##3-(-3-color(red)(6xx7))=## ##3-color(red)((-3-42))=## ##3color(red)(-(-45))=## ##3+45=48##
In each line I marked the next operation in red.
Original answer:
(-3-6x7)=-45 3--42=48