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Rpta: le queda 1/3 de fraccion y tenia 126 soles
gasto = x/3
queda = $42
x = x/3 +42
x - x/3 = 42
3x/3 - x/3 = 42
2x/3 = 42
2x = 42*3
2x = 126
x = 126/2
x = 63
el dinero inicial que tenia = $63
fraccion que queda = 42/6 simplifico saco veintiunava = 2/3