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(-15)4/-12=
(-60)/-12=
5
(+4)6.(-5)6=
24-30=
-6
[(-5)3]2.(-5)4=
(-15)2(-20)=
(-30)(-20)=
600
(+7)10:[(+7)2]4=
70/(14)(4)=
5(4)=
20