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2x-7supra9 -x-5supra6 = x-9supra8

Răspuns :

[tex] \frac{2x-7}{9} [/tex] - [tex] \frac{x-5}{6} = \frac{x-9}{8} [/tex]
aducem la acelasi numitor comun, acesta fiind 72
8(2x-7) - 12(x-5) = 9(x-9)
16x-56 - 12x + 60 = 9x - 81
4 + 81 = 9x-16x+12x
85 = -7x+12x
85 = 5x
x = 85:5
x = 17