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[1/2x(2/3xX)]=8
2X/6=8
2X=48
X=24
Andrea tiene 24 años
RSOLVIENDO:
Andrea = A
1 2
8 = ----- × ------ × A
2 3
2
8 = ----- × A
6
8 × 6 = 2 × A
48 = 2 × A
48 ÷ 2 = A
24 = A ======>>>> RTA
Andrea tiene 24 años