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Simplifying 21 = -7 + -1(2x + -1) Reorder the terms: 21 = -7 + -1(-1 + 2x) 21 = -7 + (-1 * -1 + 2x * -1) 21 = -7 + (1 + -2x) Combine like terms: -7 + 1 = -6 21 = -6 + -2x Solving 21 = -6 + -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. 21 + 2x = -6 + -2x + 2x Combine like terms: -2x + 2x = 0 21 + 2x = -6 + 0 21 + 2x = -6 Add '-21' to each side of the equation. 21 + -21 + 2x = -6 + -21 Combine like terms: 21 + -21 = 0 0 + 2x = -6 + -21 2x = -6 + -21 Combine like terms: -6 + -21 = -27 2x = -27 Divide each side by '2'. x = -13.5 Simplifying x = -13.5
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