а) 2,3х-11,2/0,7 = 1,7х-9,4/ -2,1
2,3х-16 = 1,7х- ⁹⁴/₁₀: (-²¹/₁₀)
2,3х-16 = 1,7х- ⁹⁴/₁₀ × (-¹⁰/₂₁)
2,3х-16 = 1,7х- (-⁹⁴/₂₁)
2,3х-16 = 1,7х + ⁹⁴/₂₁
2,3х-1,7x = 16 + 4¹⁰/₂₁
0,6x = 20¹⁰/₂₁
x = 20¹⁰/₂₁ : 0,6
x = 20¹⁰/₂₁ : ⁶/₁₀
x = 20¹⁰/₂₁ × ¹⁰/₆
x = ⁴³⁰/₂₁ × ¹⁰/₆
x = ⁴³⁰ˣ¹⁰/₂₁ₓ₆
x = ⁴³⁰⁰/₁₂₆
x = 34¹⁶/₁₂₆
x = 34⁸/₆₃
б) 0,4×(6х-7)=0,5×(3х+7)
2,4х-2,8 =1,5х+3,5
2,4х-1,5x =3,5 + 2,8
0,9x = 6,3
x = 6,3 : 0,9
x = 7
в)¹/₁₂у-¹/₉у-¹/₄у=1²/₃
³/₃₆у-⁴/₃₆у-⁹/₃₆у=⁵/₃
³⁻⁴⁻⁹/₃₆y = ⁵/₃
-¹⁰/₃₆y = ⁵/₃
-y = ⁵/₃ : ¹⁰/₃₆
-y = ⁵/₃ × ³⁶/₁₀
-y = ⁵ˣ³⁶/₃ₓ₁₀
-y = ¹²/₂
-y = 6
y = - 6
г) ³/₇ - ¹/₄х = 5³/₇-4х
-¹/₄x + 4x = 5³/₇ - ³/₇
3³/₄x = 5
x = 5 : 3³/₄
x = 5 : ¹⁵/₄
x = ⁵/₁ × ⁴/₁₅
x = ⁵ˣ⁴/₁₅ₓ₁
x = ⁴/₃
x = 1¹/₃