(5a + 7b -2c ) - (3a -7b +4c)
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2a+14b-6c...
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suryatapa:
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=5a +7b -2c -3a +7b -4c
=5a -3a +7b+7b -2c-4c
=2a+14b-6c
concept- if we multiply a number with negative sign
it changes its sign
=5a -3a +7b+7b -2c-4c
=2a+14b-6c
concept- if we multiply a number with negative sign
it changes its sign
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