Ineed on problem number 4,5,6,and 7 plzzz

Sadie computes the perimeter of a rectangle by adding the length, l, and width, w, and doubling this sum. eric computes the perimeter of a rectangle by doubling the length, l, doubling the width, w, and adding the doubled amounts. write an equation for sadie’s way of calculating the

Can someone me with this problem . show your work .

What does x = in this equation x+3+2x=x+5