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Unit price of jeans = $22 => price of two pairs of jeans = 2*$22 = $44

unit price of t-shirts = $8

Money available = $120

Sara plans to buy two pairs of jeans, and as many t-shirts as possible (x) within the available budget of $120.

The constraint inequality is therefore

2*22+8x ≤ 120(1)

If (1) is simplified, it becomes

44+8x ≤ 120

8x ≤ 120-44

x ≤ 76/8

x ≤ 9.5 => she can buy a maximum of 9 t-shirts.

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: