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Simplifying -1x + -18 + -2x = 21 Reorder the terms: -18 + -1x + -2x = 21 Combine like terms: -1x + -2x = -3x -18 + -3x = 21 Solving -18 + -3x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '18' to each side of the equation. -18 + 18 + -3x = 21 + 18 Combine like terms: -18 + 18 = 0 0 + -3x = 21 + 18 -3x = 21 + 18 Combine like terms: 21 + 18 = 39 -3x = 39 Divide each side by '-3'. x = -13 Simplifying x = -13
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