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Simplifying 2x + 3(10 + x) = 21 2x + (10 * 3 + x * 3) = 21 2x + (30 + 3x) = 21 Reorder the terms: 30 + 2x + 3x = 21 Combine like terms: 2x + 3x = 5x 30 + 5x = 21 Solving 30 + 5x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-30' to each side of the equation. 30 + -30 + 5x = 21 + -30 Combine like terms: 30 + -30 = 0 0 + 5x = 21 + -30 5x = 21 + -30 Combine like terms: 21 + -30 = -9 5x = -9 Divide each side by '5'. x = -1.8 Simplifying x = -1.8
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