Answer:
18. - 3; 20. - 2; 22. 4
Explanation:
18. 9= -3x
x= 9/-3=- 3
20. -6x= 12
x= - 2
22. 6x=24, x=24/6=4
18. x=(-3)
20.x=(-2)
22.x=4
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