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9 - 2m + 3 = 20 - 4m
-2m + 4m = 20 - 9 - 3
2m = 8
8
m = ------ = 4 ⇒ m = 4
2
Comprobación.
9 - (2m -3) = 20 - 4m
9 - 2(4) + 3 = 20 - 4(4)
9 - 8 + 3 = 20 - 16
4 = 4