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Simplifying 5x + 3 = -4x + 21 Reorder the terms: 3 + 5x = -4x + 21 Reorder the terms: 3 + 5x = 21 + -4x Solving 3 + 5x = 21 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 3 + 5x + 4x = 21 + -4x + 4x Combine like terms: 5x + 4x = 9x 3 + 9x = 21 + -4x + 4x Combine like terms: -4x + 4x = 0 3 + 9x = 21 + 0 3 + 9x = 21 Add '-3' to each side of the equation. 3 + -3 + 9x = 21 + -3 Combine like terms: 3 + -3 = 0 0 + 9x = 21 + -3 9x = 21 + -3 Combine like terms: 21 + -3 = 18 9x = 18 Divide each side by '9'. x = 2 Simplifying x = 2
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