Answer: [tex]\bold{\dfrac{1}{2}x-6}[/tex]
Step-by-step explanation:
Set up a table to compile the information provided.
[tex]\begin {array}{l|c|c}&\underline{Today}&\underline{\qquad in\ 5\ years\qquad }\\ Adrian&x&(x)+5\\Celine&y&y+5\\Benny&x-7&(x-7)+5=2(y+5)\\\end{array}[/tex]
We want to find Celine's age today (y) so use the "Benny in 5 years" equation to solve for y.
(x - 7) + 5 = 2(y + 5)
x - 2 = 2y + 10
x - 12 = 2y
[tex]\dfrac{x-12}{2}=y\qquad \rightarrow \qquad \dfrac{1}{2}x-6=y[/tex]
