Answer:
m-9 = 3 is the required expression
<span>3x+4=y+5, then y+5=3x+4
It is called: reflexive property
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<span>x = y and y = 10, then x = 10
It is called: equality substitution property
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13d-(-9d-4)
Transfer minus sign to all numbers in parenthesis. = 13d +9d +4 =
Answer: 22d+4