Answer:
19
Step-by-step explanation:
Matt ended up with 26.
We reverse the steps he did to get the original number that both people thought of.
26 / 2 = 13
13 - 7 = 6
6 is the original number.
Tikka did the same operations but in the reverse order so...
6 X 2 = 12
12 + 7 = 19
The answer is exactly £5,472

Now you have 2 case

and

Solve


Solve

Minus 4 on both sides

The answers are x1=0 and x2=-4