Odpowiedź:
5. (4-2x)+(8x-7) = 32x-28-16x²-14x = -16x²+18x-28
-16*(1)²+18*1-28 = -16+18-28 = -26
6. p+3
7. 3n+7n-3n = 10n-3n = 7n
