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Simplifying -3x + 3(4x + 15) = -21 Reorder the terms: -3x + 3(15 + 4x) = -21 -3x + (15 * 3 + 4x * 3) = -21 -3x + (45 + 12x) = -21 Reorder the terms: 45 + -3x + 12x = -21 Combine like terms: -3x + 12x = 9x 45 + 9x = -21 Solving 45 + 9x = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-45' to each side of the equation. 45 + -45 + 9x = -21 + -45 Combine like terms: 45 + -45 = 0 0 + 9x = -21 + -45 9x = -21 + -45 Combine like terms: -21 + -45 = -66 9x = -66 Divide each side by '9'. x = -7.333333333 Simplifying x = -7.333333333
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