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Mersul invers
(x+20):12+68=78


Răspuns :

( x + 20 ) : 12 + 68 = 78

( x + 20 ) : 12 = 78 - 68

( x + 20 ) : 12 = 10

( x + 20 ) = 10 
× 12

( x + 20 ) = 120

x = 120 - 20

x = 100
(x+20):12=78-68
              =10
a+20=10x12
a+20=120
a=120-20
a=100