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Del problema:
(2x-1)² + (2x+1)² + (2x+3)²= 155
4x² - 4x +1 + 4x² +4x +1 + 4x² +12x +9=155
12x² + 12x -144=0
x² + x - 12=0...........por aspa simple:
x...........+4
x........... -3
x+4 =0 ; x-3=0
x=-4 ; x=3
Eligiendo x= 3, los número deben ser: 5; 7;9
LA SUMA:5+7+9=21
CLAVE: C)21