4p^4 + 12p^3 + 8p^4 - 8p^3 = 12p^4 + 4p^3
8xy - 6xy - 1x + 5x - 5xy + 8xy = 7xy + 4x
x^2 - 3px^2 - 4x^3 + 7px = x^2(1 - 3p) - 4x^3 + 7px
4p^4 + 12p^3 + 8p^4 - 8p^3 = 12p^4 + 4p^3
8xy - 6xy - 1x + 5x - 5xy + 8xy = 7xy + 4x
x^2 - 3px^2 - 4x^3 + 7px = x^2(1 - 3p) - 4x^3 + 7px