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Simplifying (21 + -1x) + (2x + -3) + (x + 5) = 0 Remove parenthesis around (21 + -1x) 21 + -1x + (2x + -3) + (x + 5) = 0 Reorder the terms: 21 + -1x + (-3 + 2x) + (x + 5) = 0 Remove parenthesis around (-3 + 2x) 21 + -1x + -3 + 2x + (x + 5) = 0 Reorder the terms: 21 + -1x + -3 + 2x + (5 + x) = 0 Remove parenthesis around (5 + x) 21 + -1x + -3 + 2x + 5 + x = 0 Reorder the terms: 21 + -3 + 5 + -1x + 2x + x = 0 Combine like terms: 21 + -3 = 18 18 + 5 + -1x + 2x + x = 0 Combine like terms: 18 + 5 = 23 23 + -1x + 2x + x = 0 Combine like terms: -1x + 2x = 1x 23 + 1x + x = 0 Combine like terms: 1x + x = 2x 23 + 2x = 0 Solving 23 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-23' to each side of the equation. 23 + -23 + 2x = 0 + -23 Combine like terms: 23 + -23 = 0 0 + 2x = 0 + -23 2x = 0 + -23 Combine like terms: 0 + -23 = -23 2x = -23 Divide each side by '2'. x = -11.5 Simplifying x = -11.5
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