Question

Alguem pode me explicar ?

Answer 1

( 1.x.2 + -1.1.1 + 0.2.-2) - ( 0.x.1 + 1.1.-2 + -1.2.2) = 13

(2x - 1 + 0) - (0 - 2 - 4) = 13

2x - 1 - (-6) = 13

2x - 1 + 6 = 13

2x + 5 = 13

2x = 13 - 5

2x = 8

x = 8/2

x = 4