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x - 2 = (1 + 2 * 9)/2
x - 2 = (1 + 19)/2
x - 2 = 19/2
x = 19/2 + 2
x = (2 * 2 + 19)/2
x = (4 + 19)/2
x = 23/2
Solución :
x = 23/2