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6+x+8+x+12+x = 40+x
26+3x = 40+x
2x = 14
x = 14/2
x = 7 <== Rpta: :)
40-26 = 14
14/2 = 7
comprobación:
(6+7) + (8+7) + (12+7) = (40+7)
13 + 15 + 19 = 47
Respuesta:
B) 7