9. Resolva as equaçoes. Depois, substitua a raiz encontrada no lugar de x para verificar se vc acertou. a) x/5 + x/7 = 12. b) -x/8 = 3/2. c)x-1/2 + 3x+2/5 = 23. d) x-1/2 + x+1/3 = 2x-3/5.
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