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Simplifying (3x + 21) = (6x + 15) Reorder the terms: (21 + 3x) = (6x + 15) Remove parenthesis around (21 + 3x) 21 + 3x = (6x + 15) Reorder the terms: 21 + 3x = (15 + 6x) Remove parenthesis around (15 + 6x) 21 + 3x = 15 + 6x Solving 21 + 3x = 15 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 21 + 3x + -6x = 15 + 6x + -6x Combine like terms: 3x + -6x = -3x 21 + -3x = 15 + 6x + -6x Combine like terms: 6x + -6x = 0 21 + -3x = 15 + 0 21 + -3x = 15 Add '-21' to each side of the equation. 21 + -21 + -3x = 15 + -21 Combine like terms: 21 + -21 = 0 0 + -3x = 15 + -21 -3x = 15 + -21 Combine like terms: 15 + -21 = -6 -3x = -6 Divide each side by '-3'. x = 2 Simplifying x = 2
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