Usages of sumar
Si sé sumar y restar bien, luego me resulta más fácil hacer cualquier cálculo.
If I know how to add and subtract well, then it is easier for me to do any calculation.
Aunque el ejercicio parecía difícil, al final pude sumar, restar y encontrar el número exacto sin ayuda.
Although the exercise seemed difficult, in the end I was able to add, subtract, and find the exact number without help.
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