1) 35 + x = 200 - 140x = 200 - 140 - 35x = 60 - 35x = 25
2) 490 - x = 100 + 210x = 490 - 100 - 210x = 390 - 210x = 180
3) 200 + x = 280 + 600x = 280 + 600 - 200x = 880 - 200x = 680
1) 35 + x = 200 - 140
x = 200 - 140 - 35
x = 60 - 35
x = 25
2) 490 - x = 100 + 210
x = 490 - 100 - 210
x = 390 - 210
x = 180
3) 200 + x = 280 + 600
x = 280 + 600 - 200
x = 880 - 200
x = 680