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3/4 y+ 1/3(y-4) =y+1 / 7

Sagot :

3/4y+⅓y-⁴/³=y+¹/7
13/12y-4/3=y+1/7
13/12y-y=1/7+4/3
¹/12y=31/12
y=31
        ³/₄y + ¹/₃(y - 4) = y + ¹/₇
³/₄y + ¹/₃(y) + ¹/₃(-4) = y + ¹/₇
  ³/₄y + ¹/₃y + (-1¹/₃) = y + ¹/₇
      ³/₄y + ¹/₃y - 1¹/₃ = y + ¹/₇
            1¹/₁₂y - 1¹/₃ = y + ¹/₇
                 - y           - y       
              ¹/₁₂y - 1¹/₃ = ¹/₇
                     + 1¹/₃ + 1¹/₃
                12 · ¹/₁₂y = 1¹⁰/₂₁ · 12
                            y = 17⁵/₇