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Simplifying (4x + -21) = 3x Reorder the terms: (-21 + 4x) = 3x Remove parenthesis around (-21 + 4x) -21 + 4x = 3x Solving -21 + 4x = 3x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3x' to each side of the equation. -21 + 4x + -3x = 3x + -3x Combine like terms: 4x + -3x = 1x -21 + 1x = 3x + -3x Combine like terms: 3x + -3x = 0 -21 + 1x = 0 Add '21' to each side of the equation. -21 + 21 + 1x = 0 + 21 Combine like terms: -21 + 21 = 0 0 + 1x = 0 + 21 1x = 0 + 21 Combine like terms: 0 + 21 = 21 1x = 21 Divide each side by '1'. x = 21 Simplifying x = 21
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