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B. X= 3
C. X=7
D. X=20
x = 7 - 3
x = 4
Y así con todas.
9 + x = 12
x = 12 - 9
x = 3
2x = 19 - 5
2x = 14
x = 14/2
x = 7
x - 8 = 12
x = 12 + 8
x = 20