Question

Does anyone know how to solve this?

Answer 1

Explanation:

7−2n / 7+2n = 1 /18

Step 1: Cross-multiply.

You then get

−36n + 126 = 2n + 7

Step 2: Subtract 2n from both sides.

−36n + 126 = 2n+7

−2n −2n

−38n + 126 = 7

Step 3: Subtract 126 from both sides.

−38n + 126 = 7

−126 −126

−38n= −119

Step 4: Divide both sides by -38.

−38n /−38 = −119 /−38

n = 119 /38

Answer:

n= 119 / 38

Answer 2

119/38 = n

Explanation:

7-2n 1

------------ = ---

7+2n 18

We can use cross products to solve

(7-2n) * 18 = (7+2n) *1

Distribute

18*7 -18*2n = 7+2n

126 - 36n = 7+2n

Add 36n to each side

126 -36n+36n = 7+2n+36n

126 = 7+38n

Subtract 7 from each side

126-7 = 7+38n-7

119 = 38n

Divide by 38

119/38 = 38n/38

119/38 = n