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Simplifying (2x + 5) + -4x = 21 Reorder the terms: (5 + 2x) + -4x = 21 Remove parenthesis around (5 + 2x) 5 + 2x + -4x = 21 Combine like terms: 2x + -4x = -2x 5 + -2x = 21 Solving 5 + -2x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + -2x = 21 + -5 Combine like terms: 5 + -5 = 0 0 + -2x = 21 + -5 -2x = 21 + -5 Combine like terms: 21 + -5 = 16 -2x = 16 Divide each side by '-2'. x = -8 Simplifying x = -8
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