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x : galletas de Estefania
Solución:
2x/3 + 50 = 100
2x/3 = 100 - 50
2x/3 = 50
2x = 50 * 3
2x = 150
x = 150/2
x = 75 ----> galletas de Estefania
RTA: Estefania tenia 75 galletas.