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Simplifying 2(x + -3) + 21 = 0 Reorder the terms: 2(-3 + x) + 21 = 0 (-3 * 2 + x * 2) + 21 = 0 (-6 + 2x) + 21 = 0 Reorder the terms: -6 + 21 + 2x = 0 Combine like terms: -6 + 21 = 15 15 + 2x = 0 Solving 15 + 2x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 2x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 2x = 0 + -15 2x = 0 + -15 Combine like terms: 0 + -15 = -15 2x = -15 Divide each side by '2'. x = -7.5 Simplifying x = -7.5
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