When subtraction and addition appear in an expression without parentheses, it is agreed that the operations are performed in order of their appearance from left to right. Taking this into account, answer the following:
a. Use an appropriate model for subtraction to explain why
a— b— c = a — c — b
assuming that all expressions are meaningful.
b. Use an appropriate model for subtraction to explain why
a—b—c = a — (b+c)
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