72
Evaluate the expression for = 3.
22 - 2

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:

answer

you start with $5 and save $10 a week until you have at least $45wer

step-by-step explanation: