Determine o valor da letra:
a . (-25) =150

Calcule as expressões envolvendo adição e subtração:
a) (+8) - (+9) + (+4) - (-1) =
b) - (+5) + (-2) - (-4) + (+1) =
c) +5 - 4 + (-2) - (-1) =
d) (-3) - (-2) + (-4) - (+1) + (+6) =
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