To solve the equation \( ax - 9 = 20 \), follow these steps:
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Add 9 to both sides of the equation to isolate the term with \( x \): \[ ax - 9 + 9 = 20 + 9 \] This simplifies to: \[ ax = 29 \]
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Now, to solve for \( x \), divide both sides by \( a \) (assuming \( a \neq 0 \)): \[ x = \frac{29}{a} \]
So the solution is: \[ x = \frac{29}{a} \]