title: Dplyr - Filter if any variable is equal to a value
body: <p>I have a dataset <code>a</code> with 5 variables and want to filter it like this:</p>
  
  <pre><code>a1 &lt;- a %&gt;% filter(var_1 != 1 , var_2 != 1 , var_3 != 1 , var_4 != 1 , variable_5 != 1)
  </code></pre>
  
  <p>I was wondering if anything like this (pseudo code) existed:</p>
  
  <pre><code>a1 &lt;- a %&gt;% filter(anyvariable != 1)
  </code></pre>
  
  <p>In other words I would like to get rid of all the rows with value 1, no matter where it appears.
  1 is just a random number. It could have been 9, 99, or whatever else!
  Thanks!</p>