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- 1/3(x²)= 88-100
- 1/3(x²)= -12
(x²)= -12 : (1/3)
x²= 36
x=√36
x=6
verificación
100- 1/3(x²)= 88
100- 1/3(6²)= 88
100- 1/3(36)= 88
100- 12= 88
88=88