summerson

Hi,
the solution above was correct.
I’ll post the code if someone needs. I was putting the condition in a wrong place. correct way:

<?php $idAntigo = 0;?>
<?php if ( have_posts() ):?>
<div id="content-pages">
<?php while ( have_posts() ):the_post();?>
<?php if( $post->ID == $idAntigo ){//show nothing}else{ // show the content of search?>
<div class="postagem-search row">
	<div class="titulo-post">
		<a href="<?php the_Permalink();?>"> <?php the_title();?></a>
	</div>
	<?php if(has_post_thumbnail()):?>
		<div class="post-thumb">
   			<?php the_post_thumbnail();?>
		</div>
 	<?php endif; // fim do if has_post_thumbnail?>
	<?php  if (has_excerpt() ) : ?>
		<div class="resumo-post">
			<?php the_excerpt(); ?>
		</div>
	<?php endif; // fim do has_excerpt?>
	<a href="<?php the_Permalink();?>"><button type="button" class="btn btn-primary btn-sm">Continuar Lendo...</button></a>
</div> <!--fim da div postagem-search-->
<?php $idAntigo=$post->ID?>
<?php };?>
<?php endwhile;?>
<?php echo next_posts_link('Proxima pagina');?>
<?php echo previous_posts_link('Anterior');?>
<?php else : ?>
	<h4>Não foi encontrado resultado</h4>
<p>Tente utilizando outra palavra-chave.</p>
<?php endif; ?>