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Simplifying 3(x + 5) = 6x + 21 Reorder the terms: 3(5 + x) = 6x + 21 (5 * 3 + x * 3) = 6x + 21 (15 + 3x) = 6x + 21 Reorder the terms: 15 + 3x = 21 + 6x Solving 15 + 3x = 21 + 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. 15 + 3x + -6x = 21 + 6x + -6x Combine like terms: 3x + -6x = -3x 15 + -3x = 21 + 6x + -6x Combine like terms: 6x + -6x = 0 15 + -3x = 21 + 0 15 + -3x = 21 Add '-15' to each side of the equation. 15 + -15 + -3x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + -3x = 21 + -15 -3x = 21 + -15 Combine like terms: 21 + -15 = 6 -3x = 6 Divide each side by '-3'. x = -2 Simplifying x = -2
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