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Simplifying 12x + -15 = 3x + 30 Reorder the terms: -15 + 12x = 3x + 30 Reorder the terms: -15 + 12x = 30 + 3x Solving -15 + 12x = 30 + 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -15 + 12x + -3x = 30 + 3x + -3x Combine like terms: 12x + -3x = 9x -15 + 9x = 30 + 3x + -3x Combine like terms: 3x + -3x = 0 -15 + 9x = 30 + 0 -15 + 9x = 30 Add '15' to each side of the equation. -15 + 15 + 9x = 30 + 15 Combine like terms: -15 + 15 = 0 0 + 9x = 30 + 15 9x = 30 + 15 Combine like terms: 30 + 15 = 45 9x = 45 Divide each side by '9'. x = 5 Simplifying x = 5
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