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Simplifying 3x + 4(7.5 + 2.5x) = -9 3x + (7.5 * 4 + 2.5x * 4) = -9 3x + (30 + 10x) = -9 Reorder the terms: 30 + 3x + 10x = -9 Combine like terms: 3x + 10x = 13x 30 + 13x = -9 Solving 30 + 13x = -9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 13x = -9 + -30 Combine like terms: 30 + -30 = 0 0 + 13x = -9 + -30 13x = -9 + -30 Combine like terms: -9 + -30 = -39 13x = -39 Divide each side by '13'. x = -3 Simplifying x = -3
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