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9 - 3x + 9 = 2x - 8 + 6
-3x -2x = -8+6-9-9
-5x = -20
x = -20/-5
x = 4
3(3 - x) + 9 = 2(x - 4) + 6
9 - 3x + 9 = 2x - 8 + 6
18 - 3x = 2x - 2
18 + 2 = 2x + 3x
20 = 5x
20/5 = x
4 = x
Respuesta.
4