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Simplifying 19 * 21 = x Multiply 19 * 21 399 = x Solving 399 = 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. 399 + -1x = x + -1x Combine like terms: x + -1x = 0 399 + -1x = 0 Add '-399' to each side of the equation. 399 + -399 + -1x = 0 + -399 Combine like terms: 399 + -399 = 0 0 + -1x = 0 + -399 -1x = 0 + -399 Combine like terms: 0 + -399 = -399 -1x = -399 Divide each side by '-1'. x = 399 Simplifying x = 399
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