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Simplifying 18 = 21 + -1x Solving 18 = 21 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 18 + x = 21 + -1x + x Combine like terms: -1x + x = 0 18 + x = 21 + 0 18 + x = 21 Add '-18' to each side of the equation. 18 + -18 + x = 21 + -18 Combine like terms: 18 + -18 = 0 0 + x = 21 + -18 x = 21 + -18 Combine like terms: 21 + -18 = 3 x = 3 Simplifying x = 3
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