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a2-b2 =41
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4a = 54 . a = 54/4 ⇒ 13,5
b =7-13,5 = -6,5
a = 13,5 y b= -6,5
a - b ⇒ 13,5 -( -6,5) = 13,5 + 6,5 = 20
.............Kd