I found the answer, in the codex. I just used it’s code and adapted it, this code:
$wpdb->query( $wpdb->prepare(
"
INSERT INTO $wpdb->postmeta
( post_id, meta_key, meta_value )
VALUES ( %d, %s, %s )
",
10,
$metakey,
$metavalue
) );
So it works now.
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