2x
 = 
10
3
1

Cross multiply:
2x * 1 = 3 * 10

Simplifying
2x * 1 = 3 * 10

Reorder the terms for easier multiplication:
2 * 1x = 3 * 10

Multiply 2 * 1
2x = 3 * 10

Multiply 3 * 10
2x = 30

Solving
2x = 30

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Divide each side by '2'.
x = 15

Simplifying
x = 15