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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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