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Sagot :

Answer:

9

Step-by-step explanation:

For the equation to have more than one solution, that is infinite solutions, then both sides should be equal.

left side is

5u + 3(4u - 6)

= 5u + 12u - 18 = 17u - 18

right side is

- 3u - 27 + 20u

= 17u - 27 ← require to add 9 so equal to left side, that is

17u - 27 + 9

= 17u - 18