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Simplifying 21x + -12 = 6x + -15 Reorder the terms: -12 + 21x = 6x + -15 Reorder the terms: -12 + 21x = -15 + 6x Solving -12 + 21x = -15 + 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 = -15 + 6x + -6x Combine like terms: 21x + -6x = 15x -12 + 15x = -15 + 6x + -6x Combine like terms: 6x + -6x = 0 -12 + 15x = -15 + 0 -12 + 15x = -15 Add '12' to each side of the equation. -12 + 12 + 15x = -15 + 12 Combine like terms: -12 + 12 = 0 0 + 15x = -15 + 12 15x = -15 + 12 Combine like terms: -15 + 12 = -3 15x = -3 Divide each side by '15'. x = -0.2 Simplifying x = -0.2
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