1) 19 + (12 + 7a + 8a) = 719 + (12 + 15a) = 731 + 15a = 715a = 4a = 3
2) 54 / (x - 7) + 22 = 354 / (x - 7) = x - 7 = x = 13
3) (29 - x) * 2 - 7 = 458 - 2x - 7 = 4-2x = -1x = 8
4) 3 * (x + 4) - 12 = 23x + 12 - 12 = 23x = 2x = 8
5) 45 / (17 - x) + 9 = 245 / (17 - x) = 117 - x = x = 14
1) 19 + (12 + 7a + 8a) = 7
19 + (12 + 15a) = 7
31 + 15a = 7
15a = 4
a = 3
2) 54 / (x - 7) + 22 = 3
54 / (x - 7) =
x - 7 =
x = 13
3) (29 - x) * 2 - 7 = 4
58 - 2x - 7 = 4
-2x = -1
x = 8
4) 3 * (x + 4) - 12 = 2
3x + 12 - 12 = 2
3x = 2
x = 8
5) 45 / (17 - x) + 9 = 2
45 / (17 - x) = 1
17 - x =
x = 14