Answer:
1.) 3x + 7 = -x - 1
*collect like terms
3x + x = -1 - 7
4x = -8
x = -2
2.) 4x - 3 = 1 - 2x + 5
*collect like terms
4x + 2x = 1 + 5 + 3
6x = 9
x = 9/6
x = 3/2
3. 4x - 2 + x = 2x - 2
*collect like terms
4x + x - 2x = -2 + 2
3x = 0
x = 0/3
x = 0
4.) 3x - 4 + 1 = 5x - 5 - 2x
*collect like terms
3x - 5x + 2x = - 5 + 4 - 1
(this is a tricky one ... sorry I can't figure the answer)