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Sagot :

Answer:

a) 5x + 4x = 9x

b) 8a - 3a +7b + 2b = 5a + 9b

c) 11y - 8 + 3y + 2 = 14y - 6

d) 12x + 3y - 5z - 6x + y - 4z = 6x + 4y - 9

e) (2x - 5) + (7x + 5) = 9x

f) (- 10a + 3b - 4c) - (4a + 2b - 9c) = -14a + b + 5c

Step-by-step explanation:

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