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7⅓ - x = 3,5
²²/₃ - x = 3½
- x = ⁷/₂ - ²²/₃
- x = ²¹/₆ - ⁴⁴/₆
- x = - ²³/₆ /*(-1)
x = ²³/₆
x = 3⅚
4,2 + x = 8⅔
4²/₁₀ + x = ²⁶/₃
x = ²⁶/₃ - 4⅕
x = ²⁶/₃ - ²¹/₅
x = ¹³⁰/₁₅ - ⁶³/₁₅
x = ⁶⁷/₁₅
x = 4⁷/₁₅
x - 1,8 = 4¾
x = 4,75 + 1,8
x = 6,55
x + 6⅚ = 9,5
x + ⁴¹/₆ = 9½
x = ¹⁹/₂ - ⁴¹/₆
x = ⁵⁷/₆ - ⁴¹/₆
x = ¹⁶/₆
x = 2⁴/₆
x = 2⅔
b)
x * 2⅚ = 8,5
x * ¹⁷/₆ = 8½
x * ¹⁷/₆ = ¹⁷/₂ /:¹⁷/₆
x = ¹⁷/₂ * ⁶/₁₇
x = 3
x : 5,25 = 1⁵/₇
x : 5¼ = ¹²/₇
x : ²¹/₄ = ¹²/₇
x * ⁴/₂₁ = ¹²/₇ /:⁴/₂₁
x = ¹²/₇ * ²¹/₄
x = 9
5,2 * x = 36⅖
5,2 * x = 36,4 /:5,2
x = 7
18⅓ : x= 1⅔ /*x
⁵⁵/₃ = ⁵/₃ * x /:⁵/₃
x = ⁵⁵/₃ * ³/₅
x = 11