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Simplifying -15 + 21 = -2(x + 1) Combine like terms: -15 + 21 = 6 6 = -2(x + 1) Reorder the terms: 6 = -2(1 + x) 6 = (1 * -2 + x * -2) 6 = (-2 + -2x) Solving 6 = -2 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. 6 + 2x = -2 + -2x + 2x Combine like terms: -2x + 2x = 0 6 + 2x = -2 + 0 6 + 2x = -2 Add '-6' to each side of the equation. 6 + -6 + 2x = -2 + -6 Combine like terms: 6 + -6 = 0 0 + 2x = -2 + -6 2x = -2 + -6 Combine like terms: -2 + -6 = -8 2x = -8 Divide each side by '2'. x = -4 Simplifying x = -4
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