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12) 18a + a = 19a
13) a - 7a = -6a
14) 5m - 2m = 3m
15) -x -x = -2x
16) -12a - a = -13a
17) -18b + 22b = 4b
Saludos.........
12=19a
13=-6a
14=3m
15=-2x
16=-13a
17=4