In algebra we consider x,y and z are variables.
It is 5x+y
x + y + z = x + z + y is the commutative property of addition.
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z+3 simplified as much as possible
That depends on the values of 'z', 'y', and 'x'.
xy + y = z xy = z - y (xy)/y = (z - y)/y x = (z - y)/y
(2+x+y+6+z) += 9x,y and z are variables, there are 3.
3x + 2 = 82
(1/x) + (1/y) + (1/z) is a minimum value when x=y=z=10. Symmetry gives either maximum or minimum value.