Question

what must be subtracted from 2x+5y to get x+2y​

Answer 1

Subtract the second term from first term ans will come.

Answer 2

let,the number substracted be z

$(2x + 5y) - z = (x + 2y) \\ \\ (2x + 5y) - (x + 2y) = z \\ \\ 2x + 5y - x - 2y = z \\ \\ x + 3y = z$

x+3y must be substeacted from 2x+5y to get x+2y