a. (-3) - (-5) _ (-4) + (-9)
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Answer:
-3
Step-by-step explanation:
= (-3)-(-5)-(-4)+(-9)
= -3-(-5)-(-4)+(-9)
= -3--5-(-4)+(-9)
= -3+5-(-4)+(-9)
= -3+5--4+(-9)
= -3+5+4+(-9)
= -3+5+4+-9
= -3+5+4-9
= 2+4-9
= 6-9
= -3
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