exam Maths Puzzle Numerical Ability

Please help me!!!
How do I simplify this equation.
-12-|7-11|-[3-(-9)]
PLEASE HELP!!!

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exam Other Question

1.solve by graphing
5x-y=3
y=5x-3
2. solve by back substtution
2 4 1 :1
1 -2 -3 :2
1 1 -1 :-1 Flower Bed Find the area of a circular flower bed whose diameter is 6 meters (use 3.14 as and approximate value.

2. find the area of a triangle whose altitude is 7 ft and whose base is 22ft.

3. 18 less than a number is 23 what is the number