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Simplifying -3(2x + -1) = 2x + -21 Reorder the terms: -3(-1 + 2x) = 2x + -21 (-1 * -3 + 2x * -3) = 2x + -21 (3 + -6x) = 2x + -21 Reorder the terms: 3 + -6x = -21 + 2x Solving 3 + -6x = -21 + 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. 3 + -6x + -2x = -21 + 2x + -2x Combine like terms: -6x + -2x = -8x 3 + -8x = -21 + 2x + -2x Combine like terms: 2x + -2x = 0 3 + -8x = -21 + 0 3 + -8x = -21 Add '-3' to each side of the equation. 3 + -3 + -8x = -21 + -3 Combine like terms: 3 + -3 = 0 0 + -8x = -21 + -3 -8x = -21 + -3 Combine like terms: -21 + -3 = -24 -8x = -24 Divide each side by '-8'. x = 3 Simplifying x = 3
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