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(79-30):x=7

x×(23-16)=7

(8:x)+27=31


Răspuns :

(79-30):x=7
49:x=7
x=49:7
x=7

x*(23-16)=7
x*7=7
x=7:7
x=1

(8:x)+27=31
8:x=31-27
8:x=4
x=8:4
x=2
49:x=7
x=49:7
x=7

Xx7=7
x=7:7
x=1

8:x=31-27
8:x=4
x=2