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3 - 2(1 - x) = 5 + 7(x - 3) =
3 - 2 + 2x = 5 + 7x - 21
1 + 2x = 7x - 16
1 + 16 = 7x - 2x
17 = 5x
17/5 = x
Respuesta.
x = 17/5