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(-5)+7= - 2, (-10)+20= - 10, (-100)+95= - -5, (-40)+1= - -39, (-8)+(-7)= - -15, (-21)+(-42)= - -63, (-25)+(-11)= - -36, 6+(-12)= - -6, 7+(-10)= - -3, 12+(-3)= - 9, 15+(-28)= - -13,

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