Question

5(3-x)-4x=18
por favor !

Answer 1

5.(3 - x) - 4x = 18
15 - 5x - 4x = 18
15 - 9x = 18
15 - 18 = 9x
- 3 = 9x
9x = - 3  (:3)
3x = - 1
x = - 1
        3

Answer 2

$5(3-x)-4x=18\to \\\\ 15-5x-4x=18\to \\\\ -5x-4x=18-15\to \\\\ -9x=3\to \\\\ x=- \frac{3}{9} \to \\\\ \boxed{x=- \frac{1}{3} }$