Tìm x: 30/100 . x - 0,5 = -2,75

a, 30/100. x- 0,5= -2,75
b, -12: x= 6: 4
c, 4- 175/100: x= -5,25
d, 1- 16/5: x= 15/4
e, ( 9/8- 9/16. x): 1/8= 9/4
g, -1+ 5/12: x= -1/6