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Simplifying 18 = 12 + -21x Solving 18 = 12 + -21x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '21x' to each side of the equation. 18 + 21x = 12 + -21x + 21x Combine like terms: -21x + 21x = 0 18 + 21x = 12 + 0 18 + 21x = 12 Add '-18' to each side of the equation. 18 + -18 + 21x = 12 + -18 Combine like terms: 18 + -18 = 0 0 + 21x = 12 + -18 21x = 12 + -18 Combine like terms: 12 + -18 = -6 21x = -6 Divide each side by '21'. x = -0.2857142857 Simplifying x = -0.2857142857
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