4. Find
(a) (-7) -8-(-25)
(b) (-13) + 32-8-1
(c) (-7)+(-8) + (-90)
(d) 50 - (-40) - (-2)
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(-7) -8-(-25) = 10
(-13) + 32-8-1 = 10
(-7)+(-8) + (-90) = -105
50 - (-40) - (-2) = 92
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