What is the answer to (15)/(x+7)=(45)/(x+21) ?

The answer to (15)/(x+7)=(45)/(x+21) is x=0

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(15)/(x+7)=(45)/(x+21)

\frac{15}{x + 7} = \frac{45}{x + 21}

x = 0

Solution steps

\frac{15}{x + 7} = \frac{45}{x + 21}

Cross multiply

15 x + 315 = 45 x + 315

Move

315

to the right side

15 x = 45 x

Move

45 x

to the left side

- 30 x = 0

Divide both sides by

- 30

x = 0

Verify Solutions

Find undefined (singularity) points:

x = - 7, x = - 21

Combine undefined points with solutions:

x = 0

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

2 x - 2 + \frac{3}{x + 2} = 0

\frac{3 x + 7}{x + 2} + x = 3

ab = \frac{m}{x + 1}

0 = \frac{5}{x ^{2} + 1}

What is the answer to (15)/(x+7)=(45)/(x+21) ?
The answer to (15)/(x+7)=(45)/(x+21) is x=0
Solve for x: (15)/(x+7)=(45)/(x+21)
The solution is x=0