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= 5a+8a+8+3
= 13a+11
2. (4p-9q)+(7p+16q)
= 4p+7p-9q+16q
= 11p+9p
3. (6p-5q-2r)+(8p+6q+9r)
= 6p+8p-5q+6q+9r-2r
= 14p+q+7r
4. (3x²-7xy-2y²)+(x²+6xy+3y²)
= -7xy+6xy+3y²-2y²+3x²+x²
= -xy+y²+4x²
5. 2(3x+5y+3)+4(2y-3x+6)
= (6x+10y+6)+(8y-12x+24)
= 6x-12x+10y+8y+6+24
= -6x+18y+30