[ x = 11 ] is.
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An algebraic equation has (at least one) variable, usually called x. To solve the equation means to figure out the value of x. For example, in the equation x + 4 = 7 the solution is x = 3, because 3 + 4 = 7.
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Given the equation 3x + 4 = 7, will there ever be more than one solution for x?
If: 3x+8-x = 5x-4 Then: x = 4
4 x z = 28 z = 28/4 z = 7