What is the answer to (x-3)/4 = x/5 ?

The answer to (x-3)/4 = x/5 is x=15

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(x-3)/4 = x/5

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

x = 15

Solution steps

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

Apply fraction cross multiply: if

\frac{a}{b} = \frac{c}{d}

then

a \cdot d = b \cdot c

(x - 3) \cdot 5 = 4 x

Expand

(x - 3) \cdot 5 : 5 x - 15

5 x - 15 = 4 x

Move

15

to the right side

5 x = 4 x + 15

Move

4 x

to the left side

x = 15

q + (- 9) = 12

- 10 x + 3 (8 + 8 x) = - 6 (x - 4)

x, 8 x + 4 y = - 12

f, D = \frac{1}{2} f k

t, - t + \frac{1}{2} b = Y