Question

\(\frac{72-x}{7}=\frac{x-40}{9}\)

Answer 1

=> (72 - x) . 9 = (x - 40) . 7

=> 648 - 9x = 7x - 280

=> 648 + 280 = 7x + 9x

=> 928 = 16x

=> x = 58

Answer 2

=> (72-x).9=(x-40).7

=> 648-9x=7x-280

=> 648+280-9x-7x=0

=> 928-16x=0

=> 928=16x

=> x=928:16

=> x=58

Answer 3

x =58 . Tớ hơi bị đẳng cấp đấy

Answer 4

72-x/7=x-40/9

(72 - x) . 9 = (x - 40) . 7
<=> 648 - 9x = 7x - 280
<=> 648 + 280 = 7x + 9x
=> 928 = 16x
=> x = 58

Vậy x = 58