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Afla nescunoscutul:(875-a*5):24=15

Răspuns :

875-5a=15x24
-5a=360-875
-5a=-515 (-1)
a=515:5
a=103
875-ax5=15x24
875-ax5=360
ax5=875-360
ax5=515
a=515:4
a=103
V: (875-103x5):24=(875-515):24=360:24=15