1.) -50 = -2(a + 3)
-50 = -2a - 6
-50 + 6 = -2a
-44 = - 2a
a = 22
2.) 4 (x - 2) = 2(x - 4) + 2x
4x - 8 = 2x - 8 + 2x
4x - 8 = 4x - 8
0 = 0
All real numbers
3.) 5(y - 2) - 2. = 2(y + 1) - 5
5y - 10 - 2 = 2y + 2 - 5
5y - 12 = 2y - 3
3y = 9
y = 3
4.) -4(p + 1) = 2(8 - 2p)
-4p - 4 = 16 - 4p
- 4 ≠ 16
No solution