5+(-8)= show work with rules and tips

-13

Step-by-step explanation:

-(5+8)

-(13)

-13

Add the absolute value of each number if both are negative then just put the negative symbol in front.

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: