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Simplifying (2x + -21) = (x + 4) Reorder the terms: (-21 + 2x) = (x + 4) Remove parenthesis around (-21 + 2x) -21 + 2x = (x + 4) Reorder the terms: -21 + 2x = (4 + x) Remove parenthesis around (4 + x) -21 + 2x = 4 + x Solving -21 + 2x = 4 + 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. -21 + 2x + -1x = 4 + x + -1x Combine like terms: 2x + -1x = 1x -21 + 1x = 4 + x + -1x Combine like terms: x + -1x = 0 -21 + 1x = 4 + 0 -21 + 1x = 4 Add '21' to each side of the equation. -21 + 21 + 1x = 4 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = 4 + 21 1x = 4 + 21 Combine like terms: 4 + 21 = 25 1x = 25 Divide each side by '1'. x = 25 Simplifying x = 25
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