You can afford to buy the latest hdtv, which means that it as demand for you.

You can afford to buy the latest HDTV, which means that id does not count as a demand for you.
in principle, demand tend to refer to something that one's desire. And in General, People do not desire something that could be easily gotten

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Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].