13x(у+5x)-2x(у-6x)13xy+65x^2-2xy+12x^211xy+77x^2
5n^2(3n+1)-2n(5n^2-3)15n^3+5n^2-10n^3+6n-5n^3+5n^2+6n
x(x^3+x^2+x)-(x^3+x^2+x)x^4+x^3+x^2-x^3-x^2-xx^4-x
13x(у+5x)-2x(у-6x)
13xy+65x^2-2xy+12x^2
11xy+77x^2
5n^2(3n+1)-2n(5n^2-3)
15n^3+5n^2-10n^3+6n
-5n^3+5n^2+6n
x(x^3+x^2+x)-(x^3+x^2+x)
x^4+x^3+x^2-x^3-x^2-x
x^4-x