State which of the following is equation conatining variable $:$
$4 \times 3 + 9 = 21$

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Solution

The given expression $4 \times 3 + 9 = 21$ is a numeral equation $.$
It contains only constant values in which $L . H . S = R . H . S$
Hence $,$ the given expression $4 \times 3 + 9 = 21$ is not an algebraic equation because it does not contain any variable $.$

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State which of the following is equation conatining variable:4×3+9=21

The given expression 4×3+9=21 is a numeral equation.It contains only constant values in which L.H.S=R.H.SHence, the given expression 4×3+9=21 is not an algebraic equation because it does not contain any variable.

State which of the following is equation conatining variable $:$
$4 \times 3 + 9 = 21$

The given expression $4 \times 3 + 9 = 21$ is a numeral equation $.$
It contains only constant values in which $L . H . S = R . H . S$
Hence $,$ the given expression $4 \times 3 + 9 = 21$ is not an algebraic equation because it does not contain any variable $.$