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Simplifying -1(3x + -15) + 3(4x + 7) = 0 Reorder the terms: -1(-15 + 3x) + 3(4x + 7) = 0 (-15 * -1 + 3x * -1) + 3(4x + 7) = 0 (15 + -3x) + 3(4x + 7) = 0 Reorder the terms: 15 + -3x + 3(7 + 4x) = 0 15 + -3x + (7 * 3 + 4x * 3) = 0 15 + -3x + (21 + 12x) = 0 Reorder the terms: 15 + 21 + -3x + 12x = 0 Combine like terms: 15 + 21 = 36 36 + -3x + 12x = 0 Combine like terms: -3x + 12x = 9x 36 + 9x = 0 Solving 36 + 9x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-36' to each side of the equation. 36 + -36 + 9x = 0 + -36 Combine like terms: 36 + -36 = 0 0 + 9x = 0 + -36 9x = 0 + -36 Combine like terms: 0 + -36 = -36 9x = -36 Divide each side by '9'. x = -4 Simplifying x = -4
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