1) (5400-2700)-x=20002700-x=2000-x=2000-2700-x=-700x=700
2) (4100+4300)-x=4008400-x=400-x=400-8400-x=-8000x=8000
1) (5400-2700)-x=2000
2700-x=2000
-x=2000-2700
-x=-700
x=700
2) (4100+4300)-x=400
8400-x=400
-x=400-8400
-x=-8000
x=8000