25-[20-{10-(7-5-3)}]=

16

Step-by-step explanation:

When there are more than 1 brackets , there is a specific order of opening those brackets. First we open the bar , then round brackets , then curly brackets & then square brackets.

Using the order , let's solve this.

25-[20-{10-(7-5-3)}]

=> 25-[20-{10-(7 - 8)}]

=> 25-[20-{10 - (-1)}]

=> 25-[20- {10 + 1} ]

=> 25-[20 - {11}]

=> 25 - [ 20 - 11 ]

=> 25 - [9]

=> 25 - 9

=> 16

dhdhth

step-by-step explanation:

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: