4x-3=17 what is x equal to?

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Agroup of students want to create a garden. they do not know the exact measurements but they propose using a variable to represent the length and width of the garden. the length of the garden is 10 feet longer than double the width. use a single variable to write algebraic expressions for both the length and width of the garden. write an algebraic expression for the area of the garden. use mathematical terms to describe this expression.

Landon wrote that 3−2.6=4. which statement about his answer is true?