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Simplifying 9x + 12x + 12 = 15x + -28 Reorder the terms: 12 + 9x + 12x = 15x + -28 Combine like terms: 9x + 12x = 21x 12 + 21x = 15x + -28 Reorder the terms: 12 + 21x = -28 + 15x Solving 12 + 21x = -28 + 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. 12 + 21x + -15x = -28 + 15x + -15x Combine like terms: 21x + -15x = 6x 12 + 6x = -28 + 15x + -15x Combine like terms: 15x + -15x = 0 12 + 6x = -28 + 0 12 + 6x = -28 Add '-12' to each side of the equation. 12 + -12 + 6x = -28 + -12 Combine like terms: 12 + -12 = 0 0 + 6x = -28 + -12 6x = -28 + -12 Combine like terms: -28 + -12 = -40 6x = -40 Divide each side by '6'. x = -6.666666667 Simplifying x = -6.666666667
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