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11 + 4 = 15
It is: 11/12 plus 4/9 = 49/36
(-11*-4)+(-8) = 36
4+4=8+0=8+1=9+1=10+0=10+1=11 It equals 11. You're welcome.
SUM means plus 4+7=11
It is -4-11+18 = 3 Think of it as 18 -11 =7 and 7-4 =3