Question

Determină numărul natural x din egalitatea : {[(x- 8)•7+6-5]-4}•3-2=10.

Answer 1

{ [ ( x - 8 ) × 7 + 6 - 5 ] - 4 } × 3 - 2 = 10

{ [ ( x - 8 ) × 7 + 6 - 5 ] - 4 } × 3 = 10 + 2

{ [ ( x - 8 ) × 7 + 6 - 5 ] - 4 } × 3 = 12

[ ( x - 8 ) × 7 + 6 - 5 ] - 4 = 12 : 3

[ ( x - 8 ) × 7 + 6 - 5 ] - 4 = 4

( x - 8 ) × 7 + 6 - 5 = 4 + 4

( x - 8 ) × 7 + 6 - 5 = 8

( x - 8 ) × 7 + 6 = 8 + 5

( x - 8 ) × 7 + 6 = 13

( x - 8 ) × 7 = 13 - 6

( x - 8 ) × 7 = 7

x - 8 = 7 : 7

x - 8 = 1

x = 1 + 8

x = 9