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X -7 = - 4
just add 7 to each side
X - 7 + 7 = -4 + 7
X = 3
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check
3 - 7 = - 4
- 4 = - 4
checks
a2
4 x z = 28 z = 28/4 z = 7
The equation 3m - 3m - 7 = 0, simplifies to -7 = 0 this means that the the solution is no solution, since -7 doesn't equal 0.
If: 3x+8-x = 5x-4 Then: x = 4
15-b=7.