\(7(4x-3y)=28x-21y\)

\(-4(5a-3)=-20a+12\)

\(8(-3a+7b+6)=-24a+56b+48\)

\(-3(-2x+5)-4(-7x-9)=6x-15+28x+36=34x+21\)

\(-6p(-7p-2)=42p^2+12p\)

\(-7+(2a+3)=-7+2a+3=2a-4\)

\(-6-(8x+4)=-6-8x-4=-8x-10\)

\((-2p+6)(9q-8)=-18pq+16p+54q-48\)

\((-5a-7)(2a+6)=-10a^2-30a-14a-42=-10a^2-44a-42\)

\((x+7)(x-2)=x^2-2x+7x-14=x^2+5x-14\)

\((-4a-6)+(9a+3)=-4a-6+9a+3=5a-3\)

\((4x+6)-(-3x+5)=4x+6+3x-5=7x+1\)

\((a-7)(a-5)(a-4)=(a-7)(a^2-9a+20)=a^3-9a^2+20a-7a^2+63a-140=a^3-16a^2+83a-140\)

\(p(p-3)(p-8)=p(p^2-11p+24)=p^3-11p^2+24p\)

\((x-4)^2=x^2-8x+16\)

\((-7x+8)^2=49x^2-112x+64\)

\((9a-3b)^2=81a^2-54ab+9b^2\)

\((3a+6b)(3a-6b)=9a^2-36b^2\)

\((7p+4)(7p-4)=49p^2-16\)

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