Answer:

Step-by-step explanation:
click the link for alot more explanation, I'm tried typing
https://photomath.net/s/l5LVxj
I assume that you mean: the length is 7cm more than the width, and the perimeter is 74 cm.
If so, we can write down the following system, where l and w represent, respectively, the length and the width:

We can easily solve the second equation:

And finally solve for the length:

Answer:
a + b + ab - c
x = ———————-
a + b
Answer:
66.66 (technically and 2/3 cause 66.66 plus 33.33 is 99.99)