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Simplifying 21x + -3 = 3x + 69 Reorder the terms: -3 + 21x = 3x + 69 Reorder the terms: -3 + 21x = 69 + 3x Solving -3 + 21x = 69 + 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. -3 + 21x + -3x = 69 + 3x + -3x Combine like terms: 21x + -3x = 18x -3 + 18x = 69 + 3x + -3x Combine like terms: 3x + -3x = 0 -3 + 18x = 69 + 0 -3 + 18x = 69 Add '3' to each side of the equation. -3 + 3 + 18x = 69 + 3 Combine like terms: -3 + 3 = 0 0 + 18x = 69 + 3 18x = 69 + 3 Combine like terms: 69 + 3 = 72 18x = 72 Divide each side by '18'. x = 4 Simplifying x = 4
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