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x=17
nueno mira si gasto x me queda 85-x y si lo uso conforme al problema , y desarrollando saldria 17.
Lo que no gasto = 85 -x
x = 4( 85 -x)
x = 340 -4x
x +4x = 340
5x = 340
x = 340/5
x = 68
Lo que gasto = 68