Răspuns :
x = numărul
60 / 100 × x = 12 + x : 2
60 x / 100 = 12 + x : 2 | × 2
120 x / 100 = 24 + x
120 x = 100 × ( 24 + x )
120 x = 2400 + 100 x
120 x - 100 x = 2400
20 x = 2400 | : 20
x = 120
x = numărul
60 / 100 × x = 12 + x : 2
60 x / 100 = 12 + x : 2 | × 2
120 x / 100 = 24 + x
120 x = 100 × ( 24 + x )
120 x = 2400 + 100 x
120 x - 100 x = 2400
20 x = 2400 | : 20
x = 120