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Care este operatia prin care se afla numarul necunoscut?22-x=17.19+x=47.x-26=36

Răspuns :

22-x=17
x=22-17
x=5

19+ x=47
x=47-19
x=28

x-26=36
x=26+36
x=62
22-x=17
x=22-17
x=5
22-5=17

19+x=47
x=47-19
x=28
19+28=47

x-26=36
x=26+36
x=62
62-26=36