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Opera:
a) 19-(-3). [5 - (+8)] =
b) 12+(-5). (8 + (-9)] =
c) 12-(13-(-7)] :(-5) =
d) 10-(+20) : (7 +(-3)] =
e) (-2). (5 - 7)-(-3). (8-6) =
f) (9-6).(-2) + (13 + 3):(-4) =​