A = 81° B = 99
The reason for this is because this is a vertical angle. Vertical angles have a property where the opposite sides are equal to each other. Also you can double check this by adding them all together and it has to add up to 360° since it’s a full circle
Step-by-step explanation:
x + 5 = 3x -12 + 5
x + 5 = 3x - 7
Subtract 5 from both sides....
x + 5-5 = 3x -7 - 5
x = 3x - 12
Change the sign ...
12 = 3x - x
12 = 2x
12/2 = x
x = 6
hence 6 is the answer.......
Nine times seven degree (brain list me)