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Simplifying 4x + 5(x + 21) = 15 Reorder the terms: 4x + 5(21 + x) = 15 4x + (21 * 5 + x * 5) = 15 4x + (105 + 5x) = 15 Reorder the terms: 105 + 4x + 5x = 15 Combine like terms: 4x + 5x = 9x 105 + 9x = 15 Solving 105 + 9x = 15 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-105' to each side of the equation. 105 + -105 + 9x = 15 + -105 Combine like terms: 105 + -105 = 0 0 + 9x = 15 + -105 9x = 15 + -105 Combine like terms: 15 + -105 = -90 9x = -90 Divide each side by '9'. x = -10 Simplifying x = -10
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