You should be able to solve this.

x - 7 = 19 + x

A famous meme on /b/, well, I just solved it and want the credit.

x-x=26

(x^2)^0.5= a + and - number
For example. -3*-3=9, 3*3=9, therefore 9^0.5 = -3 and 3

+x--x=2x
x-x=26
2x=26
x=+13 and -13

>>37
Yes, you can have nonsymmetric relations, but that would be redefining '=', not having "a set defined as positive real on the left hand side of an equals sign". That makes as much sense as defining a constant to be 1 when you calculate it by hand and 2 on a calculator, except on Sundays, when it is always 5.
Sets and other mathematical entities are not defined in terms of their notation, and they don't have behaviour outside of the operations you perform on them.

Yes, I noticed the modular thing.
x = -y (mod 2), for example, simply checks for parity, so x = -x (mod 2) for all integers.

I don't see how
x - 7 = 19 + x mod (y)
makes any more sense, though?
x is still superfluous, you just get -7 = 19 (mod y). (True for y in {1, 2, 13, 26}))


>>38
You think that's bad, I can't believe it's reached 39.