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Simplifying 3x + 15 = -9x + -20 Reorder the terms: 15 + 3x = -9x + -20 Reorder the terms: 15 + 3x = -20 + -9x Solving 15 + 3x = -20 + -9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9x' to each side of the equation. 15 + 3x + 9x = -20 + -9x + 9x Combine like terms: 3x + 9x = 12x 15 + 12x = -20 + -9x + 9x Combine like terms: -9x + 9x = 0 15 + 12x = -20 + 0 15 + 12x = -20 Add '-15' to each side of the equation. 15 + -15 + 12x = -20 + -15 Combine like terms: 15 + -15 = 0 0 + 12x = -20 + -15 12x = -20 + -15 Combine like terms: -20 + -15 = -35 12x = -35 Divide each side by '12'. x = -2.916666667 Simplifying x = -2.916666667
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