Question

3/5x+2 + 5x/25x2 - 4

Answer 1

Please insert parentheses around all numerators and denominators.

Missing parentheses is the cause of many math mistakes.

I assume that the expression is to be simplified, and is:
3/(5x+2) + 5x/(25x2-4)
=3/(5x+2) + 5x/((5x+2)(5x-2))
=(3(5x-2)+5x)) / ((5x+2)(5x-2))
=(20x-6) / ((5x+2)(5x-2))
=2(10x-3) / ((5x+2)(5x-2))