Answer:
1 solution
No solution
Infinitely many solutions
1 solution
Explanation:
2.3x - 7 = -7
2.3x = 0
x = 0
1 solution
3x = 5 + 3x
0 = 5
No solution
4(10 - x) = 40 - 4x
40 - 4x = 40 - 4x
Infinitely many solutions
-7 + x = -(x + 7)
-7 + x = -x - 7
2x = 0
x = 0
1 solution