\(-2(6x-7y)=-12x+14y\)

\(-6+(-5a-7)=-6-5a-7=-5a-13\)

\(-5-(-2a+8)=-5+2a-8=2a-13\)

\(9(-4x-3)=-36x-27\)

\(3(-8p-7)-4(5p+2)=-24p-21-20p-8=-44p-29\)

\(9a(-2a-4)=-18a^2-36a\)

\((-2a+8)+(5a-6)=-2a+8+5a-6=3a+2\)

\((3x+2)-(9x-7)=3x+2+-9x+7=-6x+9\)

\(-4(5a-8b-6)=-20a+32b+24\)

\((7a+3)(4b+5)=28ab+35a+12b+15\)

\((-8x-7)(-2x+9)=16x^2-72x+14x-63=16x^2-58x-63\)

\((p-6)(p-5)=p^2-5p-6p+30=p^2-11p+30\)

\((x+9)^2=x^2+18x+81\)

\((8x-5)^2=64x^2-80x+25\)

\((2p+5q)^2=4p^2+20pq+25q^2\)

\((a-8)(a-5)(a-3)=(a-8)(a^2-8a+15)=a^3-8a^2+15a-8a^2+64a-120=a^3-16a^2+79a-120\)

\(x(x-6)(x-4)=x(x^2-10x+24)=x^3-10x^2+24x\)

\((-8p-3q)(-8p+3q)=64p^2-9q^2\)

\((-7x+8)(-7x-8)=49x^2-64\)

\((a+5)(a-5)=a^2-25\)