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600-720+72=
-120+72= -48
⇒ 600 + 80 x (- 9) + 1.800 : 25
⇒ 600 + (80 x -9) + (1.800 : 25)
⇒ (600 + -720) + 72
⇒ -120 + 72
⇒ -48.
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