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TEAS MathematicsIsolate the unknown

Algebra & Solving EquationsATI TEAS 7 cheat sheet

Isolate the unknown

10 key facts Reviewed Oct 2026
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Solve For X

  • Do the SAME operation to BOTH sides
  • Undo with the inverse: + ↔ −, × ↔ ÷
  • 2x + 3 = 7 → 2x = 4 → x = 2
  • Check by plugging your answer back in

Order Of Operations (Pemdas)

  • Parentheses → Exponents → Multiply/Divide → Add/Subtract
  • Left to right within the same level
  • 3 + 4 × 2 = 3 + 8 = 11 (not 14)

Inequalities

  • Solve like an equation
  • FLIP the sign when you × or ÷ by a negative
  • −2x < 6 → x > −3
Key takeaway

Isolate the unknown

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