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