select t.* , COUNT(DISTINCT `reserved_amount`.`id`) `reserved_amount_task`
FROM (SELECT
    `t1`.*,
    `ti`.`id_task` `task_id_favorite`,
    `tm`.`id_task` `task_id_hidden`,
    `bw`.`idu` `id_user_white_list`,
    t1.id as t1id,
    t1.amount as t1amount
FROM
    `tb_task_w` AS `t1`
        JOIN
    `tb_task_r` `completed` ON `completed`.`id_task` = `t1`.`id` AND `completed`.`status` = 2
        LEFT JOIN
    `tb_task_i` `ti` ON `ti`.`id_user` = 345437 AND `ti`.`id_task` = `t1`.`id`
        LEFT JOIN
    `tb_task_m` `tm` ON `tm`.`id_user` = 345437 AND `tm`.`id_task` = `t1`.`id`
        LEFT JOIN
    `still_block_white` `bw` ON `bw`.`idb` = 345437 AND `bw`.`idu` = `t1`.`id_author`

WHERE
        `t1`.`id` != '' AND `tm`.`id_task` IS NULL AND `completed`.`id_user` = 345437
) t
    LEFT JOIN
              `tb_task_r` `reserved_amount` ON `reserved_amount`.`id_task` = `t`.`t1id` AND `reserved_amount`.`status` IN (0,1)
GROUP BY
    `t`.`t1id`
ORDER BY
    `t`.`t1amount` DESC
LIMIT 0, 30