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Simplifying -18 = x + 21 Reorder the terms: -18 = 21 + x Solving -18 = 21 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. -18 + -1x = 21 + x + -1x Combine like terms: x + -1x = 0 -18 + -1x = 21 + 0 -18 + -1x = 21 Add '18' to each side of the equation. -18 + 18 + -1x = 21 + 18 Combine like terms: -18 + 18 = 0 0 + -1x = 21 + 18 -1x = 21 + 18 Combine like terms: 21 + 18 = 39 -1x = 39 Divide each side by '-1'. x = -39 Simplifying x = -39
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