1) 11x + 8x = 456
19x = 456
x = 24
2) 38x - 14x = 1608
24x = 1608
x = 67
3) y + 27y = 1204
28y = 1204
y = 43
4)14x - x - 28 = 167
13x = 167 + 28
13x = 195
x = 15
5)8a + 7a + 15 = 420
15a = 420-15
15a = 405
a = 27
6) 16y - 7y + 38 = 3683
9y = 3645
y = 405