Plz, help! Plz, write answer in complete sentences!

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

Twenty points. suppose that one doll house uses the 1 inch scale, meaning that 1 inch on the doll house corresponds to 1/2 foot for life-sized objects. if the doll house is 108 inches wide, what is the width of the full-sized house that it's modeled after? in inches and feet

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that