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9 - 3x + 9 = 2x - 8 + 6
18 - 3x = 2x - 2
18 + 2 = 2x + 3x
20 = 5x
x= 20/5
x = 4
Verificacion:
3(3-4)+9 = 2(4-4) + 6
3 ( -1) + 9 = 2(0) + 6
-3 + 9 = 0 + 6
6 = 6