What is the answer to 7/(x+3)= 4/12 ?

The answer to 7/(x+3)= 4/12 is x=18

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7/(x+3)= 4/12

\frac{7}{x + 3} = \frac{4}{12}

x = 18

Solution steps

\frac{7}{x + 3} = \frac{4}{12}

Cross multiply

84 = (x + 3) \cdot 4

Switch sides

(x + 3) \cdot 4 = 84

Divide both sides by

4

x + 3 = 21

Move

3

to the right side

x = 18

Verify Solutions

Find undefined (singularity) points:

x = - 3

Combine undefined points with solutions:

x = 18

\frac{p + 4}{3} = \frac{13}{p - 6}

2 x - \frac{32}{x ^{3}} = 0

r, θ = \frac{3 r + 2}{2 r + 3}

\frac{1}{y} = x + 2, y

\frac{5}{x + 2} = \frac{2}{x - 1}