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Simplifying 21x + 13 = 3x + -5 Reorder the terms: 13 + 21x = 3x + -5 Reorder the terms: 13 + 21x = -5 + 3x Solving 13 + 21x = -5 + 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. 13 + 21x + -3x = -5 + 3x + -3x Combine like terms: 21x + -3x = 18x 13 + 18x = -5 + 3x + -3x Combine like terms: 3x + -3x = 0 13 + 18x = -5 + 0 13 + 18x = -5 Add '-13' to each side of the equation. 13 + -13 + 18x = -5 + -13 Combine like terms: 13 + -13 = 0 0 + 18x = -5 + -13 18x = -5 + -13 Combine like terms: -5 + -13 = -18 18x = -18 Divide each side by '18'. x = -1 Simplifying x = -1
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