What is the answer to (12+x)/(20+x)=0.9 ?

The answer to (12+x)/(20+x)=0.9 is x=60

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(12+x)/(20+x)=0.9

\frac{12 + x}{20 + x} = 0.9

x = 60

Solution steps

\frac{12 + x}{20 + x} = 0.9

Multiply both sides by

20 + x

12 + x = 0.9 (20 + x)

Multiply both sides by

10

120 + 10 x = 9 (20 + x)

Expand

9 (20 + x) : 180 + 9 x

120 + 10 x = 180 + 9 x

Move

120

to the right side

10 x = 9 x + 60

Move

9 x

to the left side

x = 60

Verify Solutions

Find undefined (singularity) points:

x = - 20

Combine undefined points with solutions:

x = 60

\frac{6}{5} = \frac{1}{x}

4 x^{3} = 2 x^{- 1}

4 = \frac{20}{x}

\frac{2}{y - 4} = \frac{10}{y + 4}

\frac{1.4}{x} = 5

What is the answer to (12+x)/(20+x)=0.9 ?
The answer to (12+x)/(20+x)=0.9 is x=60
Solve for x: (12+x)/(20+x)=0.9
The solution is x=60