x+y does not equal 10, which can be written x+y ~= 10 or x+y != 10.
x-y does not equal 10.
If x equals 10 and y equals 10, then 9x plus 8y equals 170.
x equals 19
x=10
X= 5
(1, 9)
x = 2
If: x+10 = 15 then x = 5
-10
If 2x + 10 = x then x = -10.
This is related to an x + (x+1) + (x+2) function, in which case x equals 10. 10+11+12 is equal to 33.