30⁴/₅ - 1²/₅ ×(1⁴/₅ × (12⁷/₁₂ - 9¹⁹/₃₆)) - ¹⁷/₃₅ × 1¹¹/₃₄ = 21⁵³/₇₀
1)12⁷/₁₂ - 9¹⁹/₃₆ = ¹⁵¹/₁₂ - ³³³/₃₆ = ¹⁵¹ˣ³/₃₆ - ³³³/₃₆ = ⁴⁵³⁻³³³/₃₆ = ¹²⁰/₃₆ = ¹⁰/₃
2) 1⁴/₅ × ¹⁰/₃ = ⁹/₅ × ¹⁰/₃ = ⁹ˣ¹⁰/₅ₓ₃ = ³ˣ²/₁ₓ₁ = ⁶/₁
3) 1²/₅ × ⁶/₁ = ⁷/₅ × ⁶/₁ = ⁷ˣ⁶/₅ = ⁴²/₅ = 8²/₅
4) 30⁴/₅ - 8²/₅ = 22⁴⁻²/₅ = 22²/₅
5) ¹⁷/₃₅ × 1¹¹/₃₄ = ¹⁷/₃₅ × ⁴⁵/₃₄ = ¹⁷ˣ⁴⁵/₃₅ₓ₃₄ = ⁴⁵/₃₅ₓ₂ = ⁹/₇ₓ₂ = ⁹/₁₄
6) 22²/₅ - ⁹/₁₄ = ¹¹²/₅ - ⁹/₁₄ = ¹¹²ˣ¹⁴/₇₀ - ⁹ˣ⁵/₇₀ = ¹⁵⁶⁸/₇₀ - ⁴⁵/₇₀ = ¹⁵²³/₇₀ = 21⁵³/₇₀