3x + 7 = (9 + x) + 23x + 7 = 9 + x + 23x + 7 = 9 + 37 = This equation is inconsistent and has no solution.
5x - 1 = 4(x + 2) - (9 - x5x - 1 = 4x + 8 - 9 + 5x - 1 = 5x - This equation is an identity and has infinitely many solutions.
x + 1 = x - x + 1 = x - 1 = -This equation is inconsistent and has no solution.
3x + 7 = (9 + x) + 2
3x + 7 = 9 + x + 2
3x + 7 = 9 + 3
7 =
This equation is inconsistent and has no solution.
5x - 1 = 4(x + 2) - (9 - x
5x - 1 = 4x + 8 - 9 +
5x - 1 = 5x -
This equation is an identity and has infinitely many solutions.
x + 1 = x -
x + 1 = x -
1 = -
This equation is inconsistent and has no solution.