1.450+a=890
a=890-450
a=440
2.x-340=200
x=340+200
x=540
450+a = 930-40
450+a = 890
a = 890-450
a = 440
x-340 = 180+20
x-340 = 200
x = 200+340
x = 540
1.450+a=890
a=890-450
a=440
2.x-340=200
x=340+200
x=540
450+a = 930-40
450+a = 890
a = 890-450
a = 440
x-340 = 180+20
x-340 = 200
x = 200+340
x = 540