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// WP_Query arguments
$args = array(
	'post_type'              => array( 'zapis-na-kurs' ),
	'nopaging'               => true,
	'meta_query'             => array(
		'relation' => 'AND',
		array(
			'key'     => 'powiazany_kurs',
			'value'   => '57',
			'compare' => '=',
			'type'    => 'NUMERIC',
		),
		array(
			'key'     => 'termin_powiazanego_kursu',
			'value'   => '1',
			'compare' => '=',
			'type'    => 'NUMERIC',
		),
		array(
			'key'     => 'status_zapisu',
			'value'   => 'Zaakceptowany',
			'compare' => '=',
			'type'    => 'CHAR',
		),
	),
);

// The Query
$query = new WP_Query( $args );