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Simplifying 21x + 12 = 6x + -3 Reorder the terms: 12 + 21x = 6x + -3 Reorder the terms: 12 + 21x = -3 + 6x Solving 12 + 21x = -3 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 12 + 21x + -6x = -3 + 6x + -6x Combine like terms: 21x + -6x = 15x 12 + 15x = -3 + 6x + -6x Combine like terms: 6x + -6x = 0 12 + 15x = -3 + 0 12 + 15x = -3 Add '-12' to each side of the equation. 12 + -12 + 15x = -3 + -12 Combine like terms: 12 + -12 = 0 0 + 15x = -3 + -12 15x = -3 + -12 Combine like terms: -3 + -12 = -15 15x = -15 Divide each side by '15'. x = -1 Simplifying x = -1
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