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3(y-1/7)-y =4(2-y) solve for y

Sagot :

      3(y - ¹/₇) - y = 4(2 - y)
3(y) + 3(⁻¹/₇) - y = 4(2) + 4(-y)
    3y + (⁻³/₇) - y = 8 + (-4y)
        3y - ³/₇ - y = 8 - 4y
        3y - y - ³/₇ = 8 - 4y
             2y - ³/₇ = 8 - 4y
          + 4y              + 4y
             6y - ³/₇ = 8
                 + ³/₇ + ³/₇
                    6y = 8³/₇
                     6       6
                      y = 1¹⁷/₄₂