Expressions and Equations: Solving Real-World Problems with Equations (CCSS.6.EE.7) Practice Test

Lena has $x$ stickers. After getting 7 more stickers, she has 12 stickers. Which value makes the equation $x + 7 = 12$ true?

Three identical notebooks cost 15 dollars total. What is the solution for $x$ in $3x = 15$, where $x$ is the cost of one notebook?