Answer:
4x-1
Step-by-step explanation: All you are doing is combining x and 3x which equals 4x and coming 4 and -5 which equals -1. So the answer will be 4x-1.
Answer:
45-25 or 20 is the answer
Answer:
7-x
This is because 7 itself is decreased by a number, if for e.g that number was 5, the expression would mean 7-5= 2
Where the 2 lines meet in the middle to form an X