Question

Rezolvati ecuatia: a) 3 (2×-7)-3(3×-8) = 9× - 16-2 (3×-5)+13

Answer 1

3 ( 2 x - 7 ) - 3 ( 3 x - 8 ) = 9 x - 16 - 2 ( 3 x - 5 ) + 13

6 x - 21 - 9 x + 24 = 9 x - 16 - 6 x + 10 + 13

- 3 x + 3 = 3 x + 7

- 3 x - 3 x = 7 - 3

- 6 x = 4

x = 4 : ( - 6 )

x = - 2 / 3

Answer 2

$3(2x - 7) - 3(3x - 8) = 9x - 16 - 2(3x - 5) + 13 \\ \\ 6x - 21 - 9x + 24 = 9x - 16 - x + 10 + 13 \\ \\ - 3x + 3 = 3x + 7 \\ \\ - 3x - 3x = 7 - 3 \\ \\ - 6x = 4 \\ \\ - 6x : ( - 6) = 4 : ( - 6) \\ \\ x = - 4 : 6 \\ \\ x = - \frac{4}{6} \\ \\ = > x = - \frac{2}{3}$