20*21=x

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Solution for 20*21=x equation:


Simplifying
20 * 21 = x

Multiply 20 * 21
420 = x

Solving
420 = x

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '-1x' to each side of the equation.
420 + -1x = x + -1x

Combine like terms: x + -1x = 0
420 + -1x = 0

Add '-420' to each side of the equation.
420 + -420 + -1x = 0 + -420

Combine like terms: 420 + -420 = 0
0 + -1x = 0 + -420
-1x = 0 + -420

Combine like terms: 0 + -420 = -420
-1x = -420

Divide each side by '-1'.
x = 420

Simplifying
x = 420

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