b) Află-l pe x: [x: (110-5x21) +38]:3=18
pls repede​


Răspuns :

[ x : ( 110 - 5 × 21 ) + 38 ] : 3 = 18

[ x : ( 110 - 105 ) + 38 ] : 3 = 18

( x : 5 + 38 ) : 3 = 18 / ×3

( x : 5 + 38 ) = 54

x : 5 = 54 - 38

x : 5 = 16

x = 16 × 5

x = 80