a + 75 + 75 : 5 = 115
a + 75 + 15 = 115
a + 90 = 115
a = 115 - 90
a = 25
300 - b * 8 - 109 = 47
300 - b * 8 = 47 + 109
300 - b * 8 = 156
b * 8 = 300 - 156
b * 8 = 144
b = 144 : 8
b = 18
( 48 * c + 216 ) : 40 = 27
( 48 * c + 216 ) = 27 * 40
48 * c + 216 = 1080
48 * c = 1080 - 216
c * 8 = 864
c = 864 : 8
c = 108
