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(x . 2) : 3 - 20 = 80
(x . 2 ) :3 = 80 + 20
(x . 2) : 3 = 100
(x . 2) = 100 . 3
(x . 2 ) = 300
x = 300 : 2
x = 150
Comprobamos:
(x .2) : 3 - 20 = 160 : 2
( x. 2 ) : 3 - 20 = 80
(150 . 2) : 3 - 20 = 80
300 : 3 - 20 = 80
100 - 20 = 80
80 = 80
El número es 150.