No they’re not equivalent because for 3(2n+9) when you distribute the 3 you get 6n+27 & 5n+9+n equal to 6n+9 when you combine like terms (add the n’s).
The equations x+5x=16 and x+5x+25=16 No, the equations are not equal. In order for an equation to be equal the equation x+5x=16 contains 25 less than the second equation.
