1) 19 + (12 + 7a + 8a) = 7619 + (12 + 15a) = 7631 + 15a = 7615a = 45a = 3
2) 54 / (x - 7) + 22 = 3154 / (x - 7) = 9x - 7 = 6x = 13
3) (29 - x) * 2 - 7 = 4558 - 2x - 7 = 45-2x = -16x = 8
4) 3 * (x + 4) - 12 = 243x + 12 - 12 = 243x = 24x = 8
5) 45 / (17 - x) + 9 = 2445 / (17 - x) = 1517 - x = 3x = 14
1) 19 + (12 + 7a + 8a) = 76
19 + (12 + 15a) = 76
31 + 15a = 76
15a = 45
a = 3
2) 54 / (x - 7) + 22 = 31
54 / (x - 7) = 9
x - 7 = 6
x = 13
3) (29 - x) * 2 - 7 = 45
58 - 2x - 7 = 45
-2x = -16
x = 8
4) 3 * (x + 4) - 12 = 24
3x + 12 - 12 = 24
3x = 24
x = 8
5) 45 / (17 - x) + 9 = 24
45 / (17 - x) = 15
17 - x = 3
x = 14