Odpowiedź :
a. 5 + 6x + (4y - 5x - 4) = 5 + 6x + 4y - 5x - 4 = 1 + x + 4y
b. nie wiem o co chodzi z (7 - U +)
c. 2a + (3a - 2b) + (a + b) = 2a + 3a - 2b + a + b = 6a - b
d. 2 - 3s + (2 - 3s + 4t) + (1 + 6s) = 2 - 3s + 2 - 3s + 4t + 1 + 6s = 5 + 4t
e. 5m + 3n - 5 - (2m - 3n - 5) = 5m + 3n - 5 - 2m - 3n - 5 = 3m - 10
f. 3 - (4a - 6b) + (2 - a -7b) = 3 - 4a + 6b + 2 - a -7b = 5 - 5s - b
g. -2c + 4 - (30 + 2d) - (5d - 2) = -2c + 4 - 30 - 2d - 5d + 2 = -2c - 24 - 7d
h. 8p - (3 - 4p - r) - (2 + 3p + 5r) = 8p - 3 + 4p + r - 2 - 3p - 5r = 9p - 5 - 4r