Calcule:
a. (-2/3) + (+1/4) =
b. (-3/5) + (+3/5) =
c. (+1/7) - (+1/3) =
d. (-4/5) - (-1/8) =
e. (+2/3) - (1/3) =
f. (-1,76) + (-3,4) =
g. (-3) + (+0,46) =
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