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-6 -5 * -15 - 20=
-6 +75 - 20= 49
2) -3 - (-2 - 7) =
-3 - (-9) =
-3 +9 = 6
3) (-8 + 20) / -4 + 2 (-3) =
12/ -4 - 6 =
-3 - 6 = -9
4) 7 - 3* -2 =
7 +6 = 13
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