" -10 " is just a number. It's not a question, equation, conundrum, exercise, quandary, or
problem of any kind. It has no solutions, because there's nothing about it that needs any.
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x2-10 = 0 x2 = 10 x = the square root of 10
There are a number of possible solutions which will have x=2 and y = 10 as solutions but many of them will also allow other solutions. One possibility, with a unique solution, is (x-2)2 + (y-10)2 = 0
The equation has infinitely many solutions.
Without any + or - signs and an equality sign it has none
10