Why did she not like?
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nickiyoung
-15X-10-1X+3 = -16X-20+13, and then -16x-7 = -16x-7, which is a TRUISM (of course anything equals itself; that is the very definition of equals), and since -16x-7 is an expression that is defined for all real numbers, then that means that the solution set is ALL REAL NUMBERS (that is, the entire number line), and the original equation is an IDENTITY.