Question

Dacă a-5b=7,aflati x din relatia:x+3a-15b=29

Answer 1

x  + 3 a - 15b = x + 3 (a - 5b) = 29

Deci

x + 3 * 7 = 29

x + 21 = 29

x = 8 (dupa corectie)

Answer 2

a - 5 b = 7  

x + 3 a - 15 b = 29

x + 3 ( a - 5 b ) = 29

x + 3 × 7 = 29

x + 21 = 29

x = 29 - 21

x = 8