Answer:
18
Step-by-step explanation:
I did my method that I was taught but if you do (-5) - (-2), you get 3. So you subtract 39 by the -21 to get 18.
Opposite angles are equal in parallelogram
- 7x-4=5x+12
- 7x-5x=12+4
- 2x=16
- x=8
<M:-
Process: x^2 -12x +36 =0
(X-6) ^2 =0
X-6=0
Result: x=6
