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7x- liczba jabłoni
x+7x=720
8x=720 |÷8
x=90
7x=630
O: W sadzie rośnie 630 jabłoni i 90 grusz.
7x- jabłonie
720 = wszystkie drzewa
7x+ x = 720
8x= 720
x= 90
jabłonie = 7*90= 630
grusze= 90