=7-2- 19+ 10+6- 1+6,
=7+ 10+6+6-2- 19- 1,
=29-22,
=7 (yuan);
(2)7÷7×30= 1×30=30 (yuan).
Answer: (1) Liang Xiao has the balance of 7 yuan's money in one week, (2) In this way, Liang Xiao can balance 30 yuan's money in one month (calculated by 30 days).