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2do numero = x+1
3er numero = x+2
PLANTEO DE LA ECUACIÓN:
x-3(x+1)+(x+2)/2 = -26
x-3x-3 + (x+2)/2 = -26
x-3x + (x+2)/2 = -26+3
-2x + (x+2)/2 = -23
-4x +x+2 = -46
-4x+x = -46-2
-3x = -48
x = -48/-3
x = 16
1er numero = x = 16
2do numero = x+1 = 17
3er numero = x+2 = 18