X supra 5-x supra 8 = 2 supra 5 -1 supra 4



7x-2 supra 3 -4 supra 5 (x-3)= x+2 supra 3

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x / 5 - x / 8 = 2 / 5 - 1 / 4

8 x / 40 - 5 x / 40 = 8 / 20 - 5 / 20

3 x / 40 = 3 / 20 ⇒ 3 x · 20 = 3 · 40 ⇒ x = 120 / 60 = > x = 2

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( 7 x - 2) / 3 - 4 ( x - 3) / 5 = ( x + 2) / 3

5 ( 7 x - 2) / 15 - 12 ( x - 3 ) / 15 = ( x + 2) / 3

( 35 x - 10 ) / 15 - ( 12 x - 36 ) / 15 = ( x + 2) / 3

( 35 x - 12 x - 10 + 36 ) / 15 = ( x + 2) / 3

( 23 x + 26 ) / 15 = ( x + 2) / 3 ⇒ 3 ( 23 x + 26 ) = 15 ( x + 2) ⇒

69 x + 78 = 15 x + 30

69 x - 15 x = 30 - 78

54 x = - 48

x = - 48 / 54

x = - 8 / 9