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28+72: b+12=48 ma puteti ajuta​

Răspuns :

Salutare!

28+72:b+12=48

28+72:b=48-12

28+72:b=36

72:b=36-28

72:b=8

b=72:8

b=9

Răspuns:

72:b=a

28+a=48-12

28+a=36

a=36-28

a=8=>a=72:b=>

72:b=8

b=72:8

b=9