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Simplifying (3x + -21) = (2x + 4) Reorder the terms: (-21 + 3x) = (2x + 4) Remove parenthesis around (-21 + 3x) -21 + 3x = (2x + 4) Reorder the terms: -21 + 3x = (4 + 2x) Remove parenthesis around (4 + 2x) -21 + 3x = 4 + 2x Solving -21 + 3x = 4 + 2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2x' to each side of the equation. -21 + 3x + -2x = 4 + 2x + -2x Combine like terms: 3x + -2x = 1x -21 + 1x = 4 + 2x + -2x Combine like terms: 2x + -2x = 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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