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8 - 7
1
(15 - 6 + 4) x 2
(9 + 4) x 2
13 x 2
26
(50 + 80 - 30)/5
(130 - 30)/5
100/5
20
[(2 - 8)/(7 - 5)] x 12
[- 6/2] x 12
- 3 x 12
- 36
{[(10 x (3 + 6))/(3 x (9 - 4))]/2} x 20
{90/15/2/1} x 20
3 x 20
60
b. 20
c.20
d. -36
e. 3