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2x=1870-70
2x=1800
x=1800/2
x=900
Sofía = 2x
2x + 70 = 1870
2x = 1870 - 70
2x = 1800
x = 1800/2
x = 900
2x = 2 (900) = 1800
Solución :
Antonio tiene ahorrado = 1800