2x + 3 = 7
2x = 4
x = 2
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Not sure what you mean; that equation certainly has a solution.
An equation, solution x = -10
It does if x=2. That's the solution of your equation.
X=2
2x + 4 = 8Subtract 4 from each side of the equation:2x = 4Divide each side by 2:x = 2