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(3+4+x+7+7+9)/6=6
30+x=36
x=36-30
x=6
Odp. x=6, y=7.
(3 + 4 + x + y + 7 + 9) /6 = 6 /obustronnie razy 6
3 + 4 + x + y + 7 + 9 = 6 × 6
23 + x + y = 36 / obustronnie minus 23
x + y = 13
x + 7 = 13
x = 6
postawimy