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Simplifying 9 + 4(x + 1) = 21 Reorder the terms: 9 + 4(1 + x) = 21 9 + (1 * 4 + x * 4) = 21 9 + (4 + 4x) = 21 Combine like terms: 9 + 4 = 13 13 + 4x = 21 Solving 13 + 4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 4x = 21 + -13 Combine like terms: 13 + -13 = 0 0 + 4x = 21 + -13 4x = 21 + -13 Combine like terms: 21 + -13 = 8 4x = 8 Divide each side by '4'. x = 2 Simplifying x = 2
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