It is an algebraic expression which cannot be evaluated without information about y.
If you mean 5x+y = 21 and x = 6-2y then x = 4 and y = 1
ITS ACTUALLY CALLED A Y21, 100CC STREETBIKE, AROUND 1960'S, EMAIL ME TUPAC_4EVER62@hotmail.com, i have one too
Yamaha YA6 1964 to 1966
27x3+6=87.
3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 plus 3 is 54.
3 plus 3 plus 3 is 9. 3 plus 3 plus 3 plus 3 plus 3 plus 3 is 18.
The answer to your question is twenty four.
15
25
19 is the answer to 3 plus 4 plus 4 plus 3 plus 5
It is 77
356,433,300