Assuming all 4 numbers must be used: (9 + 4 - 7) x 3 = 18
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34 - 7 - 9 = 34 - 16 = 18 3(7 - 4) + 9 = 9 + 9 = 18 (7 - 4) x (9 - 3) = 3 x 6 = 18
1+3=4 3+4=7 4+7=11 7+11=18 11+18=29 18+29=47
It is -4-11+18 = 3 Think of it as 18 -11 =7 and 7-4 =3
18/7 * 9/12 = 18/7 * 3/4 = (18*3)/(7/4) = 54/28 = 27/14
(7 x 4) + 3 - 7 = 28 + 3 -7 = 24