Question

Twice the difference of a number and nine is 20. Someone please write it as an number equation. Pls and thx

Answer 1

$2(x-9)=20\\ x-9=\frac{20}{2} \\ x-9=10\\ x=10+9\\ x=19$

:)

Answer 2

Incase you are a visual learner this should help teach you how to show your work good luck