What is the answer to (21)/(y-8)=3 ?

The answer to (21)/(y-8)=3 is y=15

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(21)/(y-8)=3

\frac{21}{y - 8} = 3

y = 15

Solution steps

\frac{21}{y - 8} = 3

Multiply both sides by

y - 8

21 = 3 (y - 8)

Switch sides

3 (y - 8) = 21

Divide both sides by

3

y - 8 = 7

Move

8

to the right side

y = 15

Verify Solutions

Find undefined (singularity) points:

y = 8

Combine undefined points with solutions:

y = 15

0 = \frac{3 x}{x ^{2} - 9}

3 = \frac{1}{4} - \frac{5}{x}

\frac{x - 4}{x + 5} = 0

\frac{1}{x + 2} + \frac{1}{x - 3} = 4

\frac{x}{x + 1} - \frac{2}{x} = 0