No 2x10=20 and 2x11=22. They are not equal
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In normal mathematics, never.
X=5Y= 92x + 11= ?2(5)+11=?10+11= 21
This is related to an x + (x+1) + (x+2) function, in which case x equals 10. 10+11+12 is equal to 33.
2x-11=10 then 2x=21 so x =21/2
It isn't 2X10 = 20, 2X11 = 22