2x + 4 = 8
Subtract 4 from each side of the equation:
2x = 4
Divide each side by 2:
x = 2
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Not sure what you mean; that equation certainly has a solution.
2x + 3 = 72x = 4x = 2
An equation, solution x = -10
It does if x=2. That's the solution of your equation.
X=2