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(b+9)×7-2×5=60 va rog

Răspuns :

(b+9)×7-60=2×5
(b+9)×7-60=10
(b+9)×7-10=60
(b+9)×7=60+10
(b+9)×7=70
(b+9)=70:7
b+9=10
b=10-9
b=1
Sper ca te.am ajutat
Coroana ?

(b+9)×7-2×5=60

(b+9)x7-10=60

(b+9)x7=60+10

(b+9)x7=70

b+9 = 70:7

b+9 = 10

b=10-9

b =1