Реши уравнения:

a) 115-6*x=73

b) 540:x+85=91

v) 18 + (16-x) * 8=90

g) (4900:y-280) : 60=7

А) 115-6*х = 73

6*х = 115-73

х = 42:6

х = 7

b) 540:x + 85 = 91

540:x = 91 - 85

540:x = 6

x = 540:6

x = 90

v) 18 + (16-x) * 8 = 90

18 + 128 - 8x = 90

-8x = 90 - 18-128

-8x = - 56

x = 56:8

x = 7

g) (4900:y-280) : 60 = 7

4900:y - 280 = 7 * 60

4900:y = 420 + 280

y = 4900:700

y = 7