1) (6y+14)/2 + 15 = 40(6y+14)/2 = 40 - 15(6y+14)/2 = 256y + 14 = 506y = 36y = 6
2) 15c + 45 - 12 = 7815c + 33 = 7815c = 45c = 3
3) 16x + 5 = 13316x = 128x = 8
4) 42k - 28k + 180 = 60014k + 180 = 60014k = 420k = 30
5) 8y 5 = 56 540y = 280y = 7
6) 147a - 49 = (9 + 26) 7147a - 49 = 35 7147a - 49 = 245147a = 294a = 2
1) (6y+14)/2 + 15 = 40
(6y+14)/2 = 40 - 15
(6y+14)/2 = 25
6y + 14 = 50
6y = 36
y = 6
2) 15c + 45 - 12 = 78
15c + 33 = 78
15c = 45
c = 3
3) 16x + 5 = 133
16x = 128
x = 8
4) 42k - 28k + 180 = 600
14k + 180 = 600
14k = 420
k = 30
5) 8y 5 = 56 5
40y = 280
y = 7
6) 147a - 49 = (9 + 26) 7
147a - 49 = 35 7
147a - 49 = 245
147a = 294
a = 2