solve this sum using identities "(5x+6x) -(5x-6x)
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(5x+6x)-(5x-6x)
=5x+6x-5x+6x
=5x+6x+6x-5x
=17x-5x
=12x
=5x+6x-5x+6x
=5x+6x+6x-5x
=17x-5x
=12x
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