Add: 9m -4nm ,4mn -3 +8rm -2
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Step-by-step explanation:
9m -4nm + 4mn -3 +8rm -2
=9m -4nm + 4nm -3 +8rm -2
=9m -4nm + 4nm -5 +8rm
=9m-5+8rm
hope this helps you...
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