E is 5 more than d. f is 7 less than d.
a) Write an expression for e in terms of d.
e=d+5
b) Write an expression for fin terms of d.
f=d-7

c) Work out e-f
Simplify your answer.​

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James adds two numbers a + b. sally adds the same two numbers but reverse the order b + a what property of addition assures us that james and sally will get the same sum

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