Respuesta :

9x+7 = 12x-3
9x-12x=-3-7
-3x=-10
Answer: 10/3 = 3 1/3

4 1/2x =3x-1
9/2x = 3x-1
9x=6x-2
9x-6x=-2
3x=-2
Answer: -2/3
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