Logic and Reasoning
Logic and reasoning coupled with conceptual understanding will exhaust any capacity mathematical computation has to tackle a problem.
Computation is not the root of mathematics, nor that of any subject worth sequestering one’s self over.
Strengthen your conceptual understanding of the subject, it’s topics, relations, the meaning variables and the statements of the equations.
Utilize the logic and reasoning that propagates from the hardened understanding of these elements and a path will be paved to and through the computational steps.