Write the following as an equation in two variables:
$2x = 9$

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(N/A) linear equation in two variables is expressed in the form $ax + by + c = 0$.
Given the equation $2x = 9$,we can rewrite it as $2x + 0y = 9$.
Alternatively,it can be expressed as $2x + 0y - 9 = 0$.

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