Because a polygon is a shape that has equal sides and no curves.
Put 1.12 on top and times regullarly you should get 1280.00
X/-3 = 12 + x
x = -36 - 3x
4x = 36
x= = 9
The number is 9.
you first use distributive property for the multiplication
[(2*4x)-(2*11)]+9=19
8x-22+9=19
Then, you need to leave the variable alone moving all the other numbers with the opposite operation (addition to substraction, substraction to addition, multiplication to division, division to multiplication)
8x=19+22-9
8x=(19+22)-9
8x=41-9
8x=32
Then as 8 and x are multiplying you pass it dividing
x=32/8
x=4