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Simplifying -2x + 5(x + 6) = 21 Reorder the terms: -2x + 5(6 + x) = 21 -2x + (6 * 5 + x * 5) = 21 -2x + (30 + 5x) = 21 Reorder the terms: 30 + -2x + 5x = 21 Combine like terms: -2x + 5x = 3x 30 + 3x = 21 Solving 30 + 3x = 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 + 3x = 21 + -30 Combine like terms: 30 + -30 = 0 0 + 3x = 21 + -30 3x = 21 + -30 Combine like terms: 21 + -30 = -9 3x = -9 Divide each side by '3'. x = -3 Simplifying x = -3
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