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10 x 8-40 =
3x9+5x4=
(3+4) x (10-5) =
9x5-40 =
15 + 8 x 5 =
(25-15) x (100-98) =
=100-10% 70
6x7+8-40=
3+9 x 10-13=
(36-26) x (15-9)