Answer:
x = - 1
Explanation:
given
11 = 18 + 3x + 4x ← combine x terms
11 = 18 + 7x ( subtract 18 from both sides )
- 7 = 7x ( divide both sides by 7 )
- 1 = x ⇒ x = - 1
5.8m questions
7.6m answers