6)
544-49+95:(428:2-13x15)=
544-49+95:(214-195)=
544-49+95:19
544-49+5=
495+5=500
5490:18+23x15-(325:25+39:3)x25=
5490:18+23x15-(13+13)x25=
5490:18+23x15-26x25=
305+345-624=
650-624=26
7)
7843:31-25x[400-(442-1040:20)]
7843:31-25x[400-(442-52)]
7843:31-25x(400-390)
7843:31-25x10
253-250=3
19800:11-35x[225-(200-75:3)]=
19800:11-35x[225-(200-25)]=
19800:11-35x(225-175)=
19800:11-35x50=
1800-1750=50
