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If an expression is true "for no value" of x, it means that there is no value you can substitute for x to make it true. For example, x=x+1 is true for no value of x, because x is always strictly less than x+1.
If there is a proportion a/b = c/d, then ad = bc. Examples: 3/4 =? 5/6 3 x 6 =? 4 x 5 18 = 20 False (this is not a proportion) 16/6 =? 8/3 16 x 3 =? 6 x 8 48 = 48 True (this is a proportion)
There is no numerical value for 'x' that can make this a true statement.
only one value will make the equation true: 2x = 5 x=5/2 x=2.5
A variable like "x" can have any value. If you have a complete equation, like 9x + 12 = 100, a specific value of x will make the equation true; other values will make it false. But here, you don't have an equation, so any value will do for x.