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m)7-[100×68:17-5×(60×6-2×a)]:20=2​

Răspuns :

Alexandraelena2ask

100x68:17-5×(360-2×a))=-5×20

100x4-1800+10a=-100

400-1800+10a=-100

-1800+10a=-500

10a=-500+1800

10a=1300

a=13

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