tìm x $\frac{2}{5}$ + $\frac{3}{5}$ .(3.x-3,7)=

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1. `2/5 + 3/5(3x – 3,7) = -53/10`

   `⇒ 3/5(3x – 3,7) = -57/10`

   `⇒ 3x – 3,7 = -19/2`

   `⇒ 3x = -29/5`

   `⇒ x = -29/15`

    

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2. 2/5 + 3/5 . (3x – 3,7) = -53/10

   3/5 . (3x – 3,7) = -53/10 – 2/5

   3/5 . (3x – 3,7) = -57/10

   3x – 3,7 = -57/10 : 3/5

   3x – 3,7 = -19/2

   3x = -19/2 + 3,7

   3x = -29/5

   x = -29/5 : 3

   x = -29/15

   Vậy x = -29/15

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