these do not equal the same.
step by step: 3x + 4 (2x + 5)
multiply 4 by 2x, which is 8, then multiply 4 by 5, which is 20.
simplify; 3x + 8x + 20
combine like terms; (3x + 8x) + (20)
you’ll come up with 11x + 20
step by step: 6x + 5x
just add the two together and... bam, you get 11x.