( 5m2n - 3m + 1 ) - ( 4m2n - 4m )
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Step-by-step explanation:
(5m * 2n - 3m + 1) - (4m * 2n - 4m)
= (10mn - 3m + 1) - (8mn - 4m)
= 10mn - 3m + 1 - 8mn + 4m
= 2mn + m + 1
Sign of a number reverses when there is a minus sign before it
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