Mathematics

Question

What is x ?
x + 5 + 2x = x + 15

2 Answer

  • x + 5 + 2x = x + 15 = 3x + 5
    5 + 2x = 15 = 2x + 5
    2x = 10 = 2x
    x = 5
  • Answer:

    x = 5

    Step-by-step explanation:

    [tex]x+5+2x=x+15\qquad\text{combine like terms}\\\\(x+2x)+5=x+15\\\\3x+5=x+15\qquad\text{subtract 5 from both sides}\\\\3x+5-5=x+15-5\\\\3x=x+10\qquad\text{subtract}\ x\ \text{from both sides}\\\\3x-x=x-x+10\\\\2x=10\qquad\text{divide both sides by 2}\\\\\dfrac{2x}{2}=\dfrac{10}{2}\\\\x=5[/tex]

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