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Simplifying 13 * 3 = X + 20 Multiply 13 * 3 39 = X + 20 Reorder the terms: 39 = 20 + X Solving 39 = 20 + 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. 39 + -1X = 20 + X + -1X Combine like terms: X + -1X = 0 39 + -1X = 20 + 0 39 + -1X = 20 Add '-39' to each side of the equation. 39 + -39 + -1X = 20 + -39 Combine like terms: 39 + -39 = 0 0 + -1X = 20 + -39 -1X = 20 + -39 Combine like terms: 20 + -39 = -19 -1X = -19 Divide each side by '-1'. X = 19 Simplifying X = 19
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