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b) ..1.+.(-5).=(-4)
c) .-1..+.(-3)..=(-4)
d) .-2..+.(-2)..=(-4)
e) .10.+(-14)...=(-4)
f) .-100..+96...=(-4)
a) 49+ (-13) + (-7)=49-13-7=49-20=29
b) (-28)+19 + (-2)=19-30=-11
c) (-32) + 11 +21 + (-40)=-72+32=-40
d) (-121) + 104 + (-9) + 6 = 110-130=-20