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A = 7/3 (6x + 3) + 5/2 (4 - 2x)
A = 42/3x + 21 + 20/2 - 10/2x
A = 84/6x + 126/6 + 60/6 - 30/6x
A = 84x + 126 + 60 - 30x
A = 84x - 30x + 126 + 60
A = 54x + 186

B = 4 (1 - 7y) + (4y - 5) (y - 1)
B = 4 - 28y + 4y² - 4y - 8y + 5
B = 4y² - 28y - 4y - 8y + 4 + 5
B = 4y² - 40y + 9

C = 3t (t + 1) + (5 + t) (t - 2)
C = 3t² + 3 + 5t - 10 + t² - 2t
C = 3t² + t² + 5t - 2t + 3 - 10
C = 4t² + 3t - 7

D = (4k - 1) (9 + k) - 9k (10 - 3k)
D = 36k + 4k² - 9 - k - 90k + 27k²
D = 4k² + 27k² + 36k - k - 90k - 9
D = 31k²  - 55k - 9

E = (m + 2) (8 + 3m) - 2 (1 - m) (m - 7)
E = 8m + 3m² + 16 + 6m - 2 (m - 7 - m² + 7m)
E = 8m + 3m² + 16 + 6m - 2m + 14 + 2m² - 14m
E = 3m² + 2m² + 8m + 6m - 2m - 14m + 16 + 14
E = 5m² - 2m + 30