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Simplifying 13 + 2x + -1 = 3x + 21 Reorder the terms: 13 + -1 + 2x = 3x + 21 Combine like terms: 13 + -1 = 12 12 + 2x = 3x + 21 Reorder the terms: 12 + 2x = 21 + 3x Solving 12 + 2x = 21 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. 12 + 2x + -3x = 21 + 3x + -3x Combine like terms: 2x + -3x = -1x 12 + -1x = 21 + 3x + -3x Combine like terms: 3x + -3x = 0 12 + -1x = 21 + 0 12 + -1x = 21 Add '-12' to each side of the equation. 12 + -12 + -1x = 21 + -12 Combine like terms: 12 + -12 = 0 0 + -1x = 21 + -12 -1x = 21 + -12 Combine like terms: 21 + -12 = 9 -1x = 9 Divide each side by '-1'. x = -9 Simplifying x = -9
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