Tentukan nilai x A.) 7 - 2x = 1 B.) 12 - x = 2x Tolong bantu jawab yaak:')

A) 7 - 2x = 1
       -2x   = 1 - 7
       -2x   = -6
          x   = -6/-2
          x   = 3

B) 12 - x = 2x
    -x - 2x = -12
         -3x = -12
            x  = -12/-3
            x  = 4

Materi : Persamaan Linear

Pembahasan :
7 - 2x = 1
7 = 1 + 2x
2x + 1 = 7
2x = 7 - 1
2x = 6
x = 6/2
x = 3

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12 - x = 2x
2x = 12 - x
2x + x = 12
3x = 12
x = 12/3
x = 4