How do I solve y=4x+rx+6 solving for x?

Answer this question, only if you know the answer. 30 points and brainliest!

Which is the completely factored from of xy^3-x^3y

The perimeter of a rectangular lot of land is 436 ft. this includes an easement of x feet of uniform width inside the lot on which no building can be done. if the buildable area is 122 ft by 60 ft, determine the width of the easement. select one: a. 9 feet b. 18 feet c. 4.5 feet d. 7 feet