(20n + 11n⁴ ) - (15n +16n² -17n⁴

(10k4 + 17³) - (14k³ - 2k + 9k⁴)

(10p⁴ +11) - (11p⁴ + 13 +16p²)

(2a2 + 4a³) - (3a³+8)

(5ײ +4) - (5 + 5³)
with solutions ​