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