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Simplifying 15x + 12 = -3x + 12 Reorder the terms: 12 + 15x = -3x + 12 Reorder the terms: 12 + 15x = 12 + -3x Add '-12' to each side of the equation. 12 + -12 + 15x = 12 + -12 + -3x Combine like terms: 12 + -12 = 0 0 + 15x = 12 + -12 + -3x 15x = 12 + -12 + -3x Combine like terms: 12 + -12 = 0 15x = 0 + -3x 15x = -3x Solving 15x = -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. 15x + 3x = -3x + 3x Combine like terms: 15x + 3x = 18x 18x = -3x + 3x Combine like terms: -3x + 3x = 0 18x = 0 Divide each side by '18'. x = 0 Simplifying x = 0
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