9x + 4x - 3x
9x + 4x = 13x
13x - 3x = 10x
10x = answer
Hope this helped!
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Three hundred ten million, seven hundred sixty three thousand, one hundred thirty six
Square.
A square is a rectangle, so rectangle.
A rectangle is a parallelogram, so parallelogram.
Equilateral.
Also Rhombus.
(I think there may be others but these are the few I know)