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x dolar 9850 pesos
(+) (+9)
x = 500
Son 500 dolares.
750 dolares 14 625 pesos
500 dolares x pesos
( - ) ( - )
x = 9750 pesos
20 boligrafos 6,6 ml
32 boligrafos x
(+) (+)
x = 10,56 ml