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10p-8p-10-8
2p-18
b.2-10m+15m-m(3n+5)
2-10m+15m-3mn-5m
2-10m+15m-5m-3mn
2-3mn
c.8y(5x-9z)-5x(8y-9z)
40xy-72yz-40xy+45xz
40xy-40xy-72yz+45xz
-72yz+45xz