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Simplifying 18 = 9 + -3x Solving 18 = 9 + -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. 18 + 3x = 9 + -3x + 3x Combine like terms: -3x + 3x = 0 18 + 3x = 9 + 0 18 + 3x = 9 Add '-18' to each side of the equation. 18 + -18 + 3x = 9 + -18 Combine like terms: 18 + -18 = 0 0 + 3x = 9 + -18 3x = 9 + -18 Combine like terms: 9 + -18 = -9 3x = -9 Divide each side by '3'. x = -3 Simplifying x = -3
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