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18-(-4)= 18+4 = 22
-4-(-2)= -4+2 = -2
10+(-12)= 10-12 = -2
40+(-9)= 40-9 = 31
-30-(-8)= -30+8 = -22
40+(-13)= 40-13 = 27
15-(-6)= 15+6 = 21
-14+6= -8
-20-18= -38
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