90*b+50=230,1400:y-29=41, (900-x:6) * 5=4200,325 + (90-n) : 17=330

90*b+50=230

90*b=230 - 50

90*b=180

b=180:90

b=2

1400:y-29=41

1400:y = 41+29

1400:y = 70

y=1400:70

y=20

(900-x:6) * 5=4200

900-x:6=4200:5

900-x:6=840

x:6=900-840

x:6=60

x=60*6

x=360

325 + (90-n) : 17=330

(90-n) : 17=330-325

(90-n) : 17 = 5

90-n = 5*17

90-n = 85

n=90-85

n=5