What is the value of x?
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x =

Set up a ratio:
9 / 2x-1 = 15 / 3x
Cross multiply:
9 *3x = 15 * 2x-1
Simplify:
27x = 30x - 15
Subtract 30x from both sides.
-3x = -15
Divide both sides by -3:
x = -15 / -3
x = 5