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2) v?? ?? - ?? = ??

  v?? ?? = 3

              X  =   ??
                    v??

              X = v??

  s.s = { v?? }

3) ?? ?? - v?? = ??v??

  7 x = 7 v??
     X = v??

     s.s = { v?? }

4) ?? - v?? = ??

      X = 1 + v??

                 s.s = { 1 + v?? }

                    1ST TERM        MATH-PREP.2

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