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Simplifying -13 + 3x = 21x + 12 Reorder the terms: -13 + 3x = 12 + 21x Solving -13 + 3x = 12 + 21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21x' to each side of the equation. -13 + 3x + -21x = 12 + 21x + -21x Combine like terms: 3x + -21x = -18x -13 + -18x = 12 + 21x + -21x Combine like terms: 21x + -21x = 0 -13 + -18x = 12 + 0 -13 + -18x = 12 Add '13' to each side of the equation. -13 + 13 + -18x = 12 + 13 Combine like terms: -13 + 13 = 0 0 + -18x = 12 + 13 -18x = 12 + 13 Combine like terms: 12 + 13 = 25 -18x = 25 Divide each side by '-18'. x = -1.388888889 Simplifying x = -1.388888889
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