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Simplifying 3x + 15 = 30 + 15x Reorder the terms: 15 + 3x = 30 + 15x Solving 15 + 3x = 30 + 15x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15x' to each side of the equation. 15 + 3x + -15x = 30 + 15x + -15x Combine like terms: 3x + -15x = -12x 15 + -12x = 30 + 15x + -15x Combine like terms: 15x + -15x = 0 15 + -12x = 30 + 0 15 + -12x = 30 Add '-15' to each side of the equation. 15 + -15 + -12x = 30 + -15 Combine like terms: 15 + -15 = 0 0 + -12x = 30 + -15 -12x = 30 + -15 Combine like terms: 30 + -15 = 15 -12x = 15 Divide each side by '-12'. x = -1.25 Simplifying x = -1.25

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