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=(5a+3b-2)+(6-2a-10b)
=5a-2a+3b-10b-2+6
=3a-7b+4
b. 3m(8n-9p)+2m(6n-2p)
=24mn-27mp+12mn-4mp
=24mn+4mn-27mp-4mp
=20mn-31mp
c. 2a(b+3)-5a(2b-6)
=2ab+6-10ab+30
=2ab-10ab+6+30
=-8ab+36
d. x(2y+6)-(8-4x+5xy)
=2xy-5xy+6x+4x-8
=-3xy+10x-8