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= 3x² +6xy -15x
2. 3a +5 -( 2a -5)
= 3a +5 - 2a +5
= 3a - 2a +5+5
= a +10
2. (2a-5)(3a+5)
= 3a+5-2a+5
= 3a-2a+5+5
= a + 10