Using the formula 1/x=1/y-1/z, express x in terms of y and z.

Multiply both sides by x

1 = (1/y - 1/z)x

Regroup terms

1 = x(1/y - 1/z)

Divide both side by 1/y - 1/z

1/1/y - 1/z = x

Switch sides

x = 1/1/y - 1/z

x = 12

y = 15

step-by-step explanation:

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