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Simplifying 5x + 15 = 21 + 4x Reorder the terms: 15 + 5x = 21 + 4x Solving 15 + 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. 15 + 5x + -4x = 21 + 4x + -4x Combine like terms: 5x + -4x = 1x 15 + 1x = 21 + 4x + -4x Combine like terms: 4x + -4x = 0 15 + 1x = 21 + 0 15 + 1x = 21 Add '-15' to each side of the equation. 15 + -15 + 1x = 21 + -15 Combine like terms: 15 + -15 = 0 0 + 1x = 21 + -15 1x = 21 + -15 Combine like terms: 21 + -15 = 6 1x = 6 Divide each side by '1'. x = 6 Simplifying x = 6
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