Cross multiply:
x=abSolve x = ab for b
Divide each side by a
| x | |
| a |
| = |
| ab |
| a |
Cancel a on the right side:
| x | |
| a |
| = |
Cancelling the a on the right side:
| b = | x |
| a |
| b = | x |
| a |
| x | |
| a |
| = |
| ab |
| a |
| x | |
| a |
| = |
| b = | x |
| a |
| b = | x |
| a |
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