Evaluate 4m-7,when m = 5

13

Step-by-step explanation:

You would substitute the 5 where m is and then multiply the 4x5=20 then you would take that 20 and subtract 7. 20-7=13

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: