If basic math is beyond you, you really shouldn't be playing RPGs beyond White Wolf stuff because even ODnD had math (THAC0!!!).
The beauty of 3.5 was the versatility of the system. You can be what you want to be, subject to DM approval. For every Pun Pun, we had a Thief-Acrobat. For every splatbook overpowered!!!! complaint, we have a Dust of Sneezing and Choking (best weapon ever!) or Shapechange or Gate or Polymorph Any Other or Cleric or Druid or Wizard or... you get the idea.
I can't stand story-heavy RPGs. THAC0 can go suck a cock. This is exactly why I'm making my own system. 4 attributes, dropping charisma and wisdom, one caster class only, you can pick all the healing and turn undead spells you want. Skill checks are "roll under your stat on a d20", advantage and disadvantage only, no +1 bullshit. Monsters have AC and a single SKILL value. Skill is used for both combat rolls and saving throws. AC in combat is baked in the low end of the roll - if you want to hit a troll with 4 AC, you need to roll below your STR, but ABOVE 4.
No addition and subtraction and assorted bullshit for bonuses and maluses. All player-facing saving throws are "roll under your relevant stat", because why would you want to keep separate scores for saves when you already have DEX and CON?